linux-2.6-microblaze.git
3 years agoMerge tag 'fpga-late-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/mdf...
Greg Kroah-Hartman [Thu, 8 Apr 2021 06:42:08 +0000 (08:42 +0200)]
Merge tag 'fpga-late-for-5.13' of git://git./linux/kernel/git/mdf/linux-fpga into char-misc-next

Moritz writes:

Second set of FPGA Manager changes for 5.13-rc1

FPGA Manager:
- Russ' first change improves port_enable reliability
- Russ' second change adds a new device ID for a DFL device
- Geert's change updates the examples in binding with dt overlay sugar
  syntax

All patches have been reviewed on the mailing list, and have been in the
last linux-next releases (as part of my for-next branch) without issues.

Signed-off-by: Moritz Fischer <mdf@kernel.org>
* tag 'fpga-late-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/mdf/linux-fpga:
  fpga: dfl: pci: add DID for D5005 PAC cards
  dt-bindings: fpga: fpga-region: Convert to sugar syntax
  fpga: dfl: afu: harden port enable logic
  fpga: Add support for Xilinx DFX AXI Shutdown manager
  dt-bindings: fpga: Add compatible value for Xilinx DFX AXI shutdown manager
  fpga: xilinx-pr-decoupler: Simplify code by using dev_err_probe()
  fpga: fpga-mgr: xilinx-spi: fix error messages on -EPROBE_DEFER

3 years agoMAINTAINERS: Add CoreSight header files
Mathieu Poirier [Wed, 7 Apr 2021 16:00:07 +0000 (10:00 -0600)]
MAINTAINERS: Add CoreSight header files

Adding CoreSight headers to the list of supported files so that maintainers
can be notified when changes are submitted.

Link: https://lore.kernel.org/r/20210326155431.2011889-1-mathieu.poirier@linaro.org
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210407160007.418053-5-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agocoresight: core: Fix typo in coresight-core.c
Qi Liu [Wed, 7 Apr 2021 16:00:06 +0000 (10:00 -0600)]
coresight: core: Fix typo in coresight-core.c

Fix the following checkpatch warning:
WARNING: 'compoment' may be misspelled - perhaps 'component'?

Link: https://lore.kernel.org/r/1616487086-50418-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20210407160007.418053-4-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agocoresight: etm: perf: Make symbol 'format_attr_contextid' static
Wei Yongjun [Wed, 7 Apr 2021 16:00:05 +0000 (10:00 -0600)]
coresight: etm: perf: Make symbol 'format_attr_contextid' static

The sparse tool complains as follows:

drivers/hwtracing/coresight/coresight-etm-perf.c:61:25: warning:
 symbol 'format_attr_contextid' was not declared. Should it be static?

This symbol is not used outside of coresight-etm-perf.c, so this
commit marks it static.

Link: https://lore.kernel.org/r/20210308123250.2417947-1-weiyongjun1@huawei.com
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20210407160007.418053-3-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agocoresight: etm4x: Add ETM PID for Cortex-A78
Sai Prakash Ranjan [Wed, 7 Apr 2021 16:00:04 +0000 (10:00 -0600)]
coresight: etm4x: Add ETM PID for Cortex-A78

Add ETM PID for Cortex-A78 to the list of supported ETMs.

Link: https://lore.kernel.org/r/20210213112829.26834-1-saiprakash.ranjan@codeaurora.org
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20210407160007.418053-2-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoMerge tag 'phy-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux...
Greg Kroah-Hartman [Wed, 7 Apr 2021 14:52:40 +0000 (16:52 +0200)]
Merge tag 'phy-for-5.13' of git://git./linux/kernel/git/phy/linux-phy into char-misc-next

Vinod writes:

phy-for-5.13

  - Updates:
- Yaml conversion for mvebu-utmi binding, bcm-ns-usb2 and
  bcm-ns-usb3 bindings
- Mediatek dsi and hdmi phy updates
- TI j721e-wiz updates for AM64
- Cadence-torrent phy updates for SGMII/QSGMII

  - New support:
- usb3-dp phy for Qualcomm SM8250
- UTMI phy for Armada CP110
- USB phy for Qualcomm SC7280
- Binding and driver for Sparx5 ethernet serdes

* tag 'phy-for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/phy/linux-phy: (75 commits)
  phy: fix resource_size.cocci warnings
  phy: Sparx5 Eth SerDes: Use direct register operations
  phy: hisilicon: Use the correct HiSilicon copyright
  phy: marvell: phy-mvebu-cp11i-utmi needs USB_COMMON
  phy: qcom-qmp: add support for sm8250-usb3-dp phy
  phy: qcom-qmp: rename common registers
  phy: qcom-qmp: move DP functions to callbacks
  dt-bindings: phy: qcom,qmp-usb3-dp: Add support for SM8250
  dt-bindings: phy: qcom,qmp-usb3-dp-phy: move usb3 compatibles back to qcom,qmp-phy.yaml
  phy: ti: j721e-wiz: Configure 'p_standard_mode' only for DP/QSGMII
  dt-bindings: phy: fix dt_binding_check warning in mediatek, ufs-phy.yaml
  phy: zynqmp: Handle the clock enable/disable properly
  dt-bindings: phy: bcm-ns-usb3-phy: convert to yaml
  dt-bindings: phy: bcm-ns-usb2-phy: convert to yaml
  phy: microchip: PHY_SPARX5_SERDES should depend on ARCH_SPARX5
  phy: cadence-torrent: Add delay for PIPE clock to be stable
  phy: cadence-torrent: Explicitly request exclusive reset control
  phy: cadence-torrent: Do not configure SERDES if it's already configured
  phy: cadence-torrent: Group reset APIs and clock APIs
  phy: ti: j721e-wiz: Do not configure wiz if its already configured
  ...

3 years agoMerge tag 'soundwire-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul...
Greg Kroah-Hartman [Wed, 7 Apr 2021 14:51:17 +0000 (16:51 +0200)]
Merge tag 'soundwire-5.13-rc1' of git://git./linux/kernel/git/vkoul/soundwire into char-misc-next

Vinod writes:

soundwire updates for 5.13-rc1

Updates for v5.13-rc1 are:

Core:
 - Ability to add quirks for masters
 - static checker cleanup for bus code

Drivers:
 - DMI quirks for Intel controllers
 - static checker cleanup for drivers
 - add auto enumeration support qcom controller

* tag 'soundwire-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/soundwire: (45 commits)
  soundwire: intel_init: test link->cdns
  soundwire: qcom: handle return correctly in qcom_swrm_transport_params
  soundwire: qcom: cleanup internal port config indexing
  soundwire: qcom: wait for fifo space to be available before read/write
  soundwire: qcom: add static port map support
  soundwire: qcom: update port map allocation bit mask
  soundwire: add static port mapping support
  soundwire: stream: fix memory leak in stream config error path
  soundwire: qcom: use signed variable for error return
  soundwire: qcom: wait for enumeration to be complete in probe
  soundwire: qcom: add auto enumeration support
  soundwire: export sdw_compare_devid, sdw_extract_slave_id and sdw_slave_add
  soundwire: qcom: add support to new interrupts
  soundwire: qcom: update register read/write routine
  soundwire: qcom: start the clock during initialization
  soundwire: qcom: set continue execution flag for ignored commands
  soundwire: qcom: add support to missing transport params
  dt-bindings: soundwire: qcom: clarify data port bus parameters
  soundwire: cadence: only prepare attached devices on clock stop
  soundwire: generic_allocation: fix confusion between group and packing
  ...

3 years agophy: fix resource_size.cocci warnings
kernel test robot [Thu, 18 Mar 2021 23:28:44 +0000 (07:28 +0800)]
phy: fix resource_size.cocci warnings

drivers/phy/microchip/sparx5_serdes.c:2440:54-57: ERROR: Missing resource_size with iores

 Use resource_size function on resource object
 instead of explicit computation.

Generated by: scripts/coccinelle/api/resource_size.cocci

Fixes: 2ff8a1eeb5aa ("phy: Add Sparx5 ethernet serdes PHY driver")
CC: Steen Hegelund <steen.hegelund@microchip.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20210318232844.GA65886@63b0c5462fda
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agophy: Sparx5 Eth SerDes: Use direct register operations
Steen Hegelund [Mon, 29 Mar 2021 14:13:09 +0000 (16:13 +0200)]
phy: Sparx5 Eth SerDes: Use direct register operations

Use direct register operations instead of a table of register
information to lower the stack usage.

Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20210329141309.612459-2-steen.hegelund@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agophy: hisilicon: Use the correct HiSilicon copyright
Hao Fang [Thu, 1 Apr 2021 12:02:17 +0000 (20:02 +0800)]
phy: hisilicon: Use the correct HiSilicon copyright

s/Hisilicon/HiSilicon/g.
It should use capital S, according to the official website.

Signed-off-by: Hao Fang <fanghao11@huawei.com>
Link: https://lore.kernel.org/r/1617278537-26102-1-git-send-email-fanghao11@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agophy: marvell: phy-mvebu-cp11i-utmi needs USB_COMMON
Randy Dunlap [Thu, 1 Apr 2021 21:00:45 +0000 (14:00 -0700)]
phy: marvell: phy-mvebu-cp11i-utmi needs USB_COMMON

When USB and USB_COMMON are not enabled, phy-mvebu-cp110-utmi
suffers a build error due to a missing interface that is provided
by CONFIG_USB_COMMON, so make the driver depend on USB_COMMON.

ld: drivers/phy/marvell/phy-mvebu-cp110-utmi.o: in function `mvebu_cp110_utmi_phy_probe':
phy-mvebu-cp110-utmi.c:(.text+0x152): undefined reference to `of_usb_get_dr_mode_by_phy'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Kostya Porotchkin <kostap@marvell.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: linux-phy@lists.infradead.org
Link: https://lore.kernel.org/r/20210401210045.23525-1-rdunlap@infradead.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: intel_init: test link->cdns
Bard Liao [Tue, 6 Apr 2021 01:01:01 +0000 (09:01 +0800)]
soundwire: intel_init: test link->cdns

intel_link_probe() could return error and dev_get_drvdata() will return
null in such case. So we have to test link->cdns after
link->cdns = dev_get_drvdata(&ldev->auxdev.dev);
Otherwise, we will meet the "kernel NULL pointer dereference" error.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210406010101.11442-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: qcom: handle return correctly in qcom_swrm_transport_params
Srinivas Kandagatla [Thu, 1 Apr 2021 09:15:02 +0000 (10:15 +0100)]
soundwire: qcom: handle return correctly in qcom_swrm_transport_params

Looks like return from reg_write is set but not checked.
Fix this by adding error return path.

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1503591 ("UNUSED_VALUE")
Fixes: 128eaf937adb ("soundwire: qcom: add support to missing transport params")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210401091502.15825-1-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: qcom: cleanup internal port config indexing
Srinivas Kandagatla [Thu, 1 Apr 2021 09:24:54 +0000 (10:24 +0100)]
soundwire: qcom: cleanup internal port config indexing

Internally used portconfig array for storing port bandwidth
params starts from offset zero. However port zero is not really
used and we also copy the bus parameters to offset zero.
So basically we endup with a code which has to subtract 1 from port
number to get to port parameters.

This is bit confusing to the reader so, make this bit more obvious by only
copying the parameters to offset 1 instead of zero. This will avoid doing
-1 every time when we try to get port params.

Similar thing has been recently done with din/dout_port_mask.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210401092454.21299-1-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: qcom: wait for fifo space to be available before read/write
Srinivas Kandagatla [Thu, 1 Apr 2021 09:00:58 +0000 (10:00 +0100)]
soundwire: qcom: wait for fifo space to be available before read/write

If we write registers very fast we can endup in a situation where some
of the writes will be dropped without any notice.

So wait for the fifo space to be available before reading/writing the
soundwire registers.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210401090058.24041-1-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: qcom: add static port map support
Srinivas Kandagatla [Mon, 15 Mar 2021 16:56:48 +0000 (16:56 +0000)]
soundwire: qcom: add static port map support

SoundWire device ports are statically mapped to Controller ports during
design. Add support to read these from SoundWire devices.
This controller uses static port map info to setup bandwidth
parameters for those ports.

A generic port allocation is not possible in this cases!

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210315165650.13392-4-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: qcom: update port map allocation bit mask
Srinivas Kandagatla [Mon, 15 Mar 2021 16:56:47 +0000 (16:56 +0000)]
soundwire: qcom: update port map allocation bit mask

currently the internal bitmask used for allocating ports starts with offset 0.
This is bit confusing as data port numbers on Qualcomm controller are valid
from 1 to 14. So adjust this bit mask accordingly, this will also help while
adding static port map support.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210315165650.13392-3-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: add static port mapping support
Srinivas Kandagatla [Mon, 15 Mar 2021 16:56:46 +0000 (16:56 +0000)]
soundwire: add static port mapping support

Some of the SoundWire device ports are statically mapped to Controller
ports during design, however there is no way to expose this information
to the controller. Controllers like Qualcomm ones use this info to setup
static bandwidth parameters for those ports.

A generic port allocation is not possible in this cases!
So this patch adds a new member m_port_map to struct sdw_slave to expose
this static map.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210315165650.13392-2-srinivas.kandagatla@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agosoundwire: stream: fix memory leak in stream config error path
Rander Wang [Wed, 31 Mar 2021 00:46:10 +0000 (08:46 +0800)]
soundwire: stream: fix memory leak in stream config error path

When stream config is failed, master runtime will release all
slave runtime in the slave_rt_list, but slave runtime is not
added to the list at this time. This patch frees slave runtime
in the config error path to fix the memory leak.

Fixes: 89e590535f32 ("soundwire: Add support for SoundWire stream management")
Signed-off-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Keyon Jie <yang.jie@intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210331004610.12242-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
3 years agofpga: dfl: pci: add DID for D5005 PAC cards
Russ Weight [Mon, 5 Apr 2021 23:52:59 +0000 (16:52 -0700)]
fpga: dfl: pci: add DID for D5005 PAC cards

This patch adds the approved PCI Express Device IDs for the
PF and VF for the card for D5005 PAC cards.

Signed-off-by: Russ Weight <russell.h.weight@intel.com>
Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
3 years agodocs: ABI: Add sysfs documentation interface of dw-xdata-pcie driver
Gustavo Pimentel [Mon, 29 Mar 2021 11:17:48 +0000 (13:17 +0200)]
docs: ABI: Add sysfs documentation interface of dw-xdata-pcie driver

This patch describes the sysfs interface implemented on the dw-xdata-pcie
driver.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/438c4ca9f6cc9e1cb29a65c0d2cca9a3d3f181b1.1617016509.git.gustavo.pimentel@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoMAINTAINERS: Add Synopsys xData IP driver maintainer
Gustavo Pimentel [Mon, 29 Mar 2021 11:17:47 +0000 (13:17 +0200)]
MAINTAINERS: Add Synopsys xData IP driver maintainer

Add Synopsys xData IP driver maintainer.

This driver aims to support Synopsys xData IP and is normally distributed
along with Synopsys PCIe EndPoint IP as a PCIe traffic generator (depends
of the use and licensing agreement).

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/c8fb9af0ba8c86c5cf8afbfc0eb07fc99a642270.1617016509.git.gustavo.pimentel@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoDocumentation: misc-devices: Add Documentation for dw-xdata-pcie driver
Gustavo Pimentel [Mon, 29 Mar 2021 11:17:46 +0000 (13:17 +0200)]
Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver

Add Documentation for dw-xdata-pcie driver.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/764b9bf744d7fe20c7a216019eef8ddf482c1bd7.1617016509.git.gustavo.pimentel@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomisc: Add Synopsys DesignWare xData IP driver
Gustavo Pimentel [Mon, 29 Mar 2021 11:17:45 +0000 (13:17 +0200)]
misc: Add Synopsys DesignWare xData IP driver

Add Synopsys DesignWare xData IP driver. This driver enables/disables
the PCI traffic generator module pertain to the Synopsys DesignWare
prototype.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Link: https://lore.kernel.org/r/daa1efe23850e77d6807dc3f371728fc0b7548b8.1617016509.git.gustavo.pimentel@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomisc: vmw_vmci: explicitly initialize vmci_datagram payload
Tetsuo Handa [Fri, 2 Apr 2021 12:17:42 +0000 (21:17 +0900)]
misc: vmw_vmci: explicitly initialize vmci_datagram payload

KMSAN complains that vmci_check_host_caps() left the payload part of
check_msg uninitialized.

  =====================================================
  BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10
  CPU: 1 PID: 1 Comm: swapper/0 Tainted: G    B             5.11.0-rc7+ #4
  Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020
  Call Trace:
   dump_stack+0x21c/0x280
   kmsan_report+0xfb/0x1e0
   kmsan_internal_check_memory+0x202/0x520
   kmsan_check_memory+0xd/0x10
   iowrite8_rep+0x86/0x380
   vmci_guest_probe_device+0xf0b/0x1e70
   pci_device_probe+0xab3/0xe70
   really_probe+0xd16/0x24d0
   driver_probe_device+0x29d/0x3a0
   device_driver_attach+0x25a/0x490
   __driver_attach+0x78c/0x840
   bus_for_each_dev+0x210/0x340
   driver_attach+0x89/0xb0
   bus_add_driver+0x677/0xc40
   driver_register+0x485/0x8e0
   __pci_register_driver+0x1ff/0x350
   vmci_guest_init+0x3e/0x41
   vmci_drv_init+0x1d6/0x43f
   do_one_initcall+0x39c/0x9a0
   do_initcall_level+0x1d7/0x259
   do_initcalls+0x127/0x1cb
   do_basic_setup+0x33/0x36
   kernel_init_freeable+0x29a/0x3ed
   kernel_init+0x1f/0x840
   ret_from_fork+0x1f/0x30

  Uninit was created at:
   kmsan_internal_poison_shadow+0x5c/0xf0
   kmsan_slab_alloc+0x8d/0xe0
   kmem_cache_alloc+0x84f/0xe30
   vmci_guest_probe_device+0xd11/0x1e70
   pci_device_probe+0xab3/0xe70
   really_probe+0xd16/0x24d0
   driver_probe_device+0x29d/0x3a0
   device_driver_attach+0x25a/0x490
   __driver_attach+0x78c/0x840
   bus_for_each_dev+0x210/0x340
   driver_attach+0x89/0xb0
   bus_add_driver+0x677/0xc40
   driver_register+0x485/0x8e0
   __pci_register_driver+0x1ff/0x350
   vmci_guest_init+0x3e/0x41
   vmci_drv_init+0x1d6/0x43f
   do_one_initcall+0x39c/0x9a0
   do_initcall_level+0x1d7/0x259
   do_initcalls+0x127/0x1cb
   do_basic_setup+0x33/0x36
   kernel_init_freeable+0x29a/0x3ed
   kernel_init+0x1f/0x840
   ret_from_fork+0x1f/0x30

  Bytes 28-31 of 36 are uninitialized
  Memory access of size 36 starts at ffff8881675e5f00
  =====================================================

Fixes: 1f166439917b69d3 ("VMCI: guest side driver implementation.")
Cc: <stable@vger.kernel.org>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Link: https://lore.kernel.org/r/20210402121742.3917-2-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomisc: vmw_vmci: explicitly initialize vmci_notify_bm_set_msg struct
Tetsuo Handa [Fri, 2 Apr 2021 12:17:41 +0000 (21:17 +0900)]
misc: vmw_vmci: explicitly initialize vmci_notify_bm_set_msg struct

KMSAN complains that the vmci_use_ppn64() == false path in
vmci_dbell_register_notification_bitmap() left upper 32bits of
bitmap_set_msg.bitmap_ppn64 member uninitialized.

  =====================================================
  BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10
  CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.11.0-rc7+ #4
  Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020
  Call Trace:
   dump_stack+0x21c/0x280
   kmsan_report+0xfb/0x1e0
   kmsan_internal_check_memory+0x484/0x520
   kmsan_check_memory+0xd/0x10
   iowrite8_rep+0x86/0x380
   vmci_send_datagram+0x150/0x280
   vmci_dbell_register_notification_bitmap+0x133/0x1e0
   vmci_guest_probe_device+0xcab/0x1e70
   pci_device_probe+0xab3/0xe70
   really_probe+0xd16/0x24d0
   driver_probe_device+0x29d/0x3a0
   device_driver_attach+0x25a/0x490
   __driver_attach+0x78c/0x840
   bus_for_each_dev+0x210/0x340
   driver_attach+0x89/0xb0
   bus_add_driver+0x677/0xc40
   driver_register+0x485/0x8e0
   __pci_register_driver+0x1ff/0x350
   vmci_guest_init+0x3e/0x41
   vmci_drv_init+0x1d6/0x43f
   do_one_initcall+0x39c/0x9a0
   do_initcall_level+0x1d7/0x259
   do_initcalls+0x127/0x1cb
   do_basic_setup+0x33/0x36
   kernel_init_freeable+0x29a/0x3ed
   kernel_init+0x1f/0x840
   ret_from_fork+0x1f/0x30

  Local variable ----bitmap_set_msg@vmci_dbell_register_notification_bitmap created at:
   vmci_dbell_register_notification_bitmap+0x50/0x1e0
   vmci_dbell_register_notification_bitmap+0x50/0x1e0

  Bytes 28-31 of 32 are uninitialized
  Memory access of size 32 starts at ffff88810098f570
  =====================================================

Fixes: 83e2ec765be03e8a ("VMCI: doorbell implementation.")
Cc: <stable@vger.kernel.org>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Link: https://lore.kernel.org/r/20210402121742.3917-1-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoMerge 5.12-rc6 into char-misc-next
Greg Kroah-Hartman [Mon, 5 Apr 2021 06:43:50 +0000 (08:43 +0200)]
Merge 5.12-rc6 into char-misc-next

We need the char/misc fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoLinux 5.12-rc6
Linus Torvalds [Sun, 4 Apr 2021 21:15:36 +0000 (14:15 -0700)]
Linux 5.12-rc6

3 years agofirewire: nosy: Fix a use-after-free bug in nosy_ioctl()
Zheyu Ma [Sat, 3 Apr 2021 06:58:36 +0000 (06:58 +0000)]
firewire: nosy: Fix a use-after-free bug in nosy_ioctl()

For each device, the nosy driver allocates a pcilynx structure.
A use-after-free might happen in the following scenario:

 1. Open nosy device for the first time and call ioctl with command
    NOSY_IOC_START, then a new client A will be malloced and added to
    doubly linked list.
 2. Open nosy device for the second time and call ioctl with command
    NOSY_IOC_START, then a new client B will be malloced and added to
    doubly linked list.
 3. Call ioctl with command NOSY_IOC_START for client A, then client A
    will be readded to the doubly linked list. Now the doubly linked
    list is messed up.
 4. Close the first nosy device and nosy_release will be called. In
    nosy_release, client A will be unlinked and freed.
 5. Close the second nosy device, and client A will be referenced,
    resulting in UAF.

The root cause of this bug is that the element in the doubly linked list
is reentered into the list.

Fix this bug by adding a check before inserting a client.  If a client
is already in the linked list, don't insert it.

The following KASAN report reveals it:

   BUG: KASAN: use-after-free in nosy_release+0x1ea/0x210
   Write of size 8 at addr ffff888102ad7360 by task poc
   CPU: 3 PID: 337 Comm: poc Not tainted 5.12.0-rc5+ #6
   Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
   Call Trace:
     nosy_release+0x1ea/0x210
     __fput+0x1e2/0x840
     task_work_run+0xe8/0x180
     exit_to_user_mode_prepare+0x114/0x120
     syscall_exit_to_user_mode+0x1d/0x40
     entry_SYSCALL_64_after_hwframe+0x44/0xae

   Allocated by task 337:
     nosy_open+0x154/0x4d0
     misc_open+0x2ec/0x410
     chrdev_open+0x20d/0x5a0
     do_dentry_open+0x40f/0xe80
     path_openat+0x1cf9/0x37b0
     do_filp_open+0x16d/0x390
     do_sys_openat2+0x11d/0x360
     __x64_sys_open+0xfd/0x1a0
     do_syscall_64+0x33/0x40
     entry_SYSCALL_64_after_hwframe+0x44/0xae

   Freed by task 337:
     kfree+0x8f/0x210
     nosy_release+0x158/0x210
     __fput+0x1e2/0x840
     task_work_run+0xe8/0x180
     exit_to_user_mode_prepare+0x114/0x120
     syscall_exit_to_user_mode+0x1d/0x40
     entry_SYSCALL_64_after_hwframe+0x44/0xae

   The buggy address belongs to the object at ffff888102ad7300 which belongs to the cache kmalloc-128 of size 128
   The buggy address is located 96 bytes inside of 128-byte region [ffff888102ad7300ffff888102ad7380)

[ Modified to use 'list_empty()' inside proper lock  - Linus ]

Link: https://lore.kernel.org/lkml/1617433116-5930-1-git-send-email-zheyuma97@gmail.com/
Reported-and-tested-by: 马哲宇 (Zheyu Ma) <zheyuma97@gmail.com>
Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
3 years agoMerge tag 'for-linus' of git://github.com/openrisc/linux
Linus Torvalds [Sat, 3 Apr 2021 22:42:45 +0000 (15:42 -0700)]
Merge tag 'for-linus' of git://github.com/openrisc/linux

Pull OpenRISC fix from Stafford Horne:
 "Fix duplicate header include in Litex SOC driver"

* tag 'for-linus' of git://github.com/openrisc/linux:
  soc: litex: Remove duplicated header file inclusion

3 years agoMerge tag 'io_uring-5.12-2021-04-03' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 3 Apr 2021 21:26:47 +0000 (14:26 -0700)]
Merge tag 'io_uring-5.12-2021-04-03' of git://git.kernel.dk/linux-block

POull io_uring fix from Jens Axboe:
 "Just fixing a silly braino in a previous patch, where we'd end up
  failing to compile if CONFIG_BLOCK isn't enabled.

  Not that a lot of people do that, but kernel bot spotted it and it's
  probably prudent to just flush this out now before -rc6.

  Sorry about that, none of my test compile configs have !CONFIG_BLOCK"

* tag 'io_uring-5.12-2021-04-03' of git://git.kernel.dk/linux-block:
  io_uring: fix !CONFIG_BLOCK compilation failure

3 years agosoc: litex: Remove duplicated header file inclusion
Zhen Lei [Wed, 31 Mar 2021 13:06:43 +0000 (15:06 +0200)]
soc: litex: Remove duplicated header file inclusion

The header file <linux/errno.h> is already included above and can be
removed here.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Mateusz Holenko <mholenko@antmicro.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
3 years agoMerge tag 'gfs2-v5.12-rc2-fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 3 Apr 2021 19:15:01 +0000 (12:15 -0700)]
Merge tag 'gfs2-v5.12-rc2-fixes2' of git://git./linux/kernel/git/gfs2/linux-gfs2

Pull gfs2 fixes from Andreas Gruenbacher:
 "Two more gfs2 fixes"

* tag 'gfs2-v5.12-rc2-fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: report "already frozen/thawed" errors
  gfs2: Flag a withdraw if init_threads() fails

3 years agoMerge tag 'riscv-for-linus-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 3 Apr 2021 18:52:18 +0000 (11:52 -0700)]
Merge tag 'riscv-for-linus-5.12-rc6' of git://git./linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:
 "A handful of fixes for 5.12:

   - fix a stack tracing regression related to "const register asm"
     variables, which have unexpected behavior.

   - ensure the value to be written by put_user() is evaluated before
     enabling access to userspace memory..

   - align the exception vector table correctly, so we don't rely on the
     firmware's handling of unaligned accesses.

   - build fix to make NUMA depend on MMU, which triggered on some
     randconfigs"

* tag 'riscv-for-linus-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: Make NUMA depend on MMU
  riscv: remove unneeded semicolon
  riscv,entry: fix misaligned base for excp_vect_table
  riscv: evaluate put_user() arg before enabling user access
  riscv: Drop const annotation for sp

3 years agoMerge tag 'powerpc-5.12-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
Linus Torvalds [Sat, 3 Apr 2021 17:49:38 +0000 (10:49 -0700)]
Merge tag 'powerpc-5.12-5' of git://git./linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Fix a bug on pseries where spurious wakeups from H_PROD would prevent
  partition migration from succeeding.

  Fix oopses seen in pcpu_alloc(), caused by parallel faults of the
  percpu mapping causing us to corrupt the protection key used for the
  mapping, and cause a fatal key fault.

  Thanks to Aneesh Kumar K.V, Murilo Opsfelder Araujo, and Nathan Lynch"

* tag 'powerpc-5.12-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/mm/book3s64: Use the correct storage key value when calling H_PROTECT
  powerpc/pseries/mobility: handle premature return from H_JOIN
  powerpc/pseries/mobility: use struct for shared state

3 years agoMerge tag 'hyperv-fixes-signed-20210402' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sat, 3 Apr 2021 17:42:20 +0000 (10:42 -0700)]
Merge tag 'hyperv-fixes-signed-20210402' of git://git./linux/kernel/git/hyperv/linux

Pull Hyper-V fixes from Wei Liu:
 "One fix from Lu Yunlong for a double free in hvfb_probe"

* tag 'hyperv-fixes-signed-20210402' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
  video: hyperv_fb: Fix a double free in hvfb_probe

3 years agoMerge tag 'driver-core-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 3 Apr 2021 17:14:47 +0000 (10:14 -0700)]
Merge tag 'driver-core-5.12-rc6' of git://git./linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
 "Here is a single driver core fix for a reported problem with differed
  probing. It has been in linux-next for a while with no reported
  problems"

* tag 'driver-core-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  driver core: clear deferred probe reason on probe retry

3 years agoMerge tag 'char-misc-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregk...
Linus Torvalds [Sat, 3 Apr 2021 17:05:16 +0000 (10:05 -0700)]
Merge tag 'char-misc-5.12-rc6' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are a few small driver char/misc changes for 5.12-rc6.

  Nothing major here, a few fixes for reported issues:

   - interconnect fixes for problems found

   - fbcon syzbot-found fix

   - extcon fixes

   - firmware stratix10 bugfix

   - MAINTAINERS file update.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  drivers: video: fbcon: fix NULL dereference in fbcon_cursor()
  mei: allow map and unmap of client dma buffer only for disconnected client
  MAINTAINERS: Add linux-phy list and patchwork
  interconnect: Fix kerneldoc warning
  firmware: stratix10-svc: reset COMMAND_RECONFIG_FLAG_PARTIAL to 0
  extcon: Fix error handling in extcon_dev_register
  extcon: Add stubs for extcon_register_notifier_all() functions
  interconnect: core: fix error return code of icc_link_destroy()
  interconnect: qcom: msm8939: remove rpm-ids from non-RPM nodes

3 years agoMerge tag 'staging-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sat, 3 Apr 2021 17:03:51 +0000 (10:03 -0700)]
Merge tag 'staging-5.12-rc6' of git://git./linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are two rtl8192e staging driver fixes for reported problems.

  Both of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: rtl8192e: Change state information from u16 to u8
  staging: rtl8192e: Fix incorrect source in memcpy()

3 years agoMerge tag 'tty-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Sat, 3 Apr 2021 17:00:53 +0000 (10:00 -0700)]
Merge tag 'tty-5.12-rc6' of git://git./linux/kernel/git/gregkh/tty

Pull serial driver fix from Greg KH:
 "Here is a single serial driver fix for 5.12-rc6. Is is a revert of a
  change that showed up in 5.9 that has been reported to cause problems.

  It has been in linux-next for a while with no reported issues"

* tag 'tty-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  soc: qcom-geni-se: Cleanup the code to remove proxy votes

3 years agoMerge tag 'usb-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sat, 3 Apr 2021 16:56:22 +0000 (09:56 -0700)]
Merge tag 'usb-5.12-rc6' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here are a few small USB driver fixes for 5.12-rc6 to resolve reported
  problems.

  They include:

   - a number of cdc-acm fixes for reported problems. It seems more
     people are using this driver lately...

   - dwc3 driver fixes for reported problems, and fixes for the fixes :)

   - dwc2 driver fixes for reported issues.

   - musb driver fix.

   - new USB quirk additions.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'usb-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (23 commits)
  usb: dwc2: Prevent core suspend when port connection flag is 0
  usb: dwc2: Fix HPRT0.PrtSusp bit setting for HiKey 960 board.
  usb: musb: Fix suspend with devices connected for a64
  usb: xhci-mtk: fix broken streams issue on 0.96 xHCI
  usb: dwc3: gadget: Clear DEP flags after stop transfers in ep disable
  usbip: vhci_hcd fix shift out-of-bounds in vhci_hub_control()
  USB: quirks: ignore remote wake-up on Fibocom L850-GL LTE modem
  USB: cdc-acm: do not log successful probe on later errors
  USB: cdc-acm: always claim data interface
  USB: cdc-acm: use negation for NULL checks
  USB: cdc-acm: clean up probe error labels
  USB: cdc-acm: drop redundant driver-data reset
  USB: cdc-acm: drop redundant driver-data assignment
  USB: cdc-acm: fix use-after-free after probe failure
  USB: cdc-acm: fix double free on probe failure
  USB: cdc-acm: downgrade message to debug
  USB: cdc-acm: untangle a circular dependency between callback and softint
  cdc-acm: fix BREAK rx code path adding necessary calls
  usb: gadget: udc: amd5536udc_pci fix null-ptr-dereference
  usb: dwc3: pci: Enable dis_uX_susphy_quirk for Intel Merrifield
  ...

3 years agoMerge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Linus Torvalds [Sat, 3 Apr 2021 16:07:35 +0000 (09:07 -0700)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi

Pull SCSI fix from James Bottomley:
 "A single fix to iscsi for a rare race condition which can cause a
  kernel panic"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: iscsi: Fix race condition between login and sync thread

3 years agoio_uring: fix !CONFIG_BLOCK compilation failure
Jens Axboe [Sat, 3 Apr 2021 01:45:34 +0000 (19:45 -0600)]
io_uring: fix !CONFIG_BLOCK compilation failure

kernel test robot correctly pinpoints a compilation failure if
CONFIG_BLOCK isn't set:

fs/io_uring.c: In function '__io_complete_rw':
>> fs/io_uring.c:2509:48: error: implicit declaration of function 'io_rw_should_reissue'; did you mean 'io_rw_reissue'? [-Werror=implicit-function-declaration]
    2509 |  if ((res == -EAGAIN || res == -EOPNOTSUPP) && io_rw_should_reissue(req)) {
         |                                                ^~~~~~~~~~~~~~~~~~~~
         |                                                io_rw_reissue
    cc1: some warnings being treated as errors

Ensure that we have a stub declaration of io_rw_should_reissue() for
!CONFIG_BLOCK.

Fixes: 230d50d448ac ("io_uring: move reissue into regular IO path")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoMerge tag 'block-5.12-2021-04-02' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 2 Apr 2021 23:13:13 +0000 (16:13 -0700)]
Merge tag 'block-5.12-2021-04-02' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - Remove comment that never came to fruition in 22 years of development
   (Christoph)

 - Remove unused request flag (Christoph)

 - Fix for null_blk fake timeout handling (Damien)

 - Fix for IOCB_NOWAIT being ignored for O_DIRECT on raw bdevs (Pavel)

 - Error propagation fix for multiple split bios (Yufen)

* tag 'block-5.12-2021-04-02' of git://git.kernel.dk/linux-block:
  block: remove the unused RQF_ALLOCED flag
  block: update a few comments in uapi/linux/blkpg.h
  block: don't ignore REQ_NOWAIT for direct IO
  null_blk: fix command timeout completion handling
  block: only update parent bi_status when bio fail

3 years agoMerge tag 'io_uring-5.12-2021-04-02' of git://git.kernel.dk/linux-block
Linus Torvalds [Fri, 2 Apr 2021 23:08:19 +0000 (16:08 -0700)]
Merge tag 'io_uring-5.12-2021-04-02' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Nothing really major in here, and finally nothing really related to
  signals. A few minor fixups related to the threading changes, and some
  general fixes, that's it.

  There's the pending gdb-get-confused-about-arch, but that's more of a
  cosmetic issue, nothing that hinder use of it. And given that other
  archs will likely be affected by that oddity too, better to postpone
  any changes there until 5.13 imho"

* tag 'io_uring-5.12-2021-04-02' of git://git.kernel.dk/linux-block:
  io_uring: move reissue into regular IO path
  io_uring: fix EIOCBQUEUED iter revert
  io_uring/io-wq: protect against sprintf overflow
  io_uring: don't mark S_ISBLK async work as unbounded
  io_uring: drop sqd lock before handling signals for SQPOLL
  io_uring: handle setup-failed ctx in kill_timeouts
  io_uring: always go for cancellation spin on exec

3 years agoMerge tag 'acpi-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
Linus Torvalds [Fri, 2 Apr 2021 22:34:17 +0000 (15:34 -0700)]
Merge tag 'acpi-5.12-rc6' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix an ACPI tables management issue, an issue related to the
  ACPI enumeration of devices and CPU wakeup in the ACPI processor
  driver.

  Specifics:

   - Ensure that the memory occupied by ACPI tables on x86 will always
     be reserved to prevent it from being allocated for other purposes
     which was possible in some cases (Rafael Wysocki).

   - Fix the ACPI device enumeration code to prevent it from attempting
     to evaluate the _STA control method for devices with unmet
     dependencies which is likely to fail (Hans de Goede).

   - Fix the handling of CPU0 wakeup in the ACPI processor driver to
     prevent CPU0 online failures from occurring (Vitaly Kuznetsov)"

* tag 'acpi-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: processor: Fix CPU0 wakeup in acpi_idle_play_dead()
  ACPI: scan: Fix _STA getting called on devices with unmet dependencies
  ACPI: tables: x86: Reserve memory occupied by ACPI tables

3 years agoMerge tag 'pm-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Linus Torvalds [Fri, 2 Apr 2021 22:17:08 +0000 (15:17 -0700)]
Merge tag 'pm-5.12-rc6' of git://git./linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix a race condition and an ordering issue related to using
  device links in the runtime PM framework and two kerneldoc comments in
  cpufreq.

  Specifics:

   - Fix race condition related to the handling of supplier devices
     during consumer device probe and fix the order of decrementation of
     two related reference counters in the runtime PM core code handling
     supplier devices (Adrian Hunter).

   - Fix kerneldoc comments in cpufreq that have not been updated along
     with the functions documented by them (Geert Uytterhoeven)"

* tag 'pm-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: runtime: Fix race getting/putting suppliers at probe
  PM: runtime: Fix ordering in pm_runtime_get_suppliers()
  cpufreq: Fix scaling_{available,boost}_frequencies_show() comments

3 years agoblock: remove the unused RQF_ALLOCED flag
Christoph Hellwig [Fri, 2 Apr 2021 17:17:46 +0000 (19:17 +0200)]
block: remove the unused RQF_ALLOCED flag

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoblock: update a few comments in uapi/linux/blkpg.h
Christoph Hellwig [Fri, 2 Apr 2021 17:17:31 +0000 (19:17 +0200)]
block: update a few comments in uapi/linux/blkpg.h

The big top of the file comment talk about grand plans that never
happened, so remove them to not confuse the readers.  Also mark the
devname and volname fields as ignored as they were never used by the
kernel.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agodt-bindings: fpga: fpga-region: Convert to sugar syntax
Geert Uytterhoeven [Fri, 2 Apr 2021 11:57:49 +0000 (13:57 +0200)]
dt-bindings: fpga: fpga-region: Convert to sugar syntax

Using overlay sugar syntax makes the DTS files easier to read (and
write).

While at it, fix two build issues:
  - "/dts-v1/" and "/plugin/" must be separate statements.
  - Add a missing closing curly brace.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
3 years agoMerge tag 'trace-v5.12-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rosted...
Linus Torvalds [Fri, 2 Apr 2021 15:39:00 +0000 (08:39 -0700)]
Merge tag 'trace-v5.12-rc5-2' of git://git./linux/kernel/git/rostedt/linux-trace

Pull tracing fix from Steven Rostedt:
 "Fix stack trace entry size to stop showing garbage

  The macro that creates both the structure and the format displayed to
  user space for the stack trace event was changed a while ago to fix
  the parsing by user space tooling. But this change also modified the
  structure used to store the stack trace event. It changed the caller
  array field from [0] to [8].

  Even though the size in the ring buffer is dynamic and can be
  something other than 8 (user space knows how to handle this), the 8
  extra words was not accounted for when reserving the event on the ring
  buffer, and added 8 more entries, due to the calculation of
  "sizeof(*entry) + nr_entries * sizeof(long)", as the sizeof(*entry)
  now contains 8 entries.

  The size of the caller field needs to be subtracted from the size of
  the entry to create the correct allocation size"

* tag 'trace-v5.12-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Fix stack trace event size

3 years agoio_uring: move reissue into regular IO path
Jens Axboe [Fri, 2 Apr 2021 02:41:15 +0000 (20:41 -0600)]
io_uring: move reissue into regular IO path

It's non-obvious how retry is done for block backed files, when it happens
off the kiocb done path. It also makes it tricky to deal with the iov_iter
handling.

Just mark the req as needing a reissue, and handling it from the
submission path instead. This makes it directly obvious that we're not
re-importing the iovec from userspace past the submit point, and it means
that we can just reuse our usual -EAGAIN retry path from the read/write
handling.

At some point in the future, we'll gain the ability to always reliably
return -EAGAIN through the stack. A previous attempt on the block side
didn't pan out and got reverted, hence the need to check for this
information out-of-band right now.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoMerge branches 'acpi-tables' and 'acpi-scan'
Rafael J. Wysocki [Fri, 2 Apr 2021 14:57:56 +0000 (16:57 +0200)]
Merge branches 'acpi-tables' and 'acpi-scan'

* acpi-tables:
  ACPI: tables: x86: Reserve memory occupied by ACPI tables

* acpi-scan:
  ACPI: scan: Fix _STA getting called on devices with unmet dependencies

3 years agoMerge branch 'pm-cpufreq'
Rafael J. Wysocki [Fri, 2 Apr 2021 14:45:58 +0000 (16:45 +0200)]
Merge branch 'pm-cpufreq'

* pm-cpufreq:
  cpufreq: Fix scaling_{available,boost}_frequencies_show() comments

3 years agoblock: don't ignore REQ_NOWAIT for direct IO
Pavel Begunkov [Fri, 20 Nov 2020 17:10:28 +0000 (17:10 +0000)]
block: don't ignore REQ_NOWAIT for direct IO

If IOCB_NOWAIT is set on submission, then that needs to get propagated to
REQ_NOWAIT on the block side. Otherwise we completely lose this
information, and any issuer of IOCB_NOWAIT IO will potentially end up
blocking on eg request allocation on the storage side.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agofirmware: google: Enable s0ix logging by default
Evan Green [Thu, 1 Apr 2021 21:04:36 +0000 (14:04 -0700)]
firmware: google: Enable s0ix logging by default

Many moons ago, support was added to the SMI handlers to log s0ix entry
and exit. Early iterations of firmware on Apollo Lake correctly returned
"unsupported" for this new command they did not recognize, but
unfortunately also contained a quirk where this command would cause them
to power down rather than resume from s0ix.

Fixes for this quirk were pushed out long ago, so all APL devices still
in the field should have updated firmware. As such, we no longer need to
have the s0ix_logging_enable be opt-in, where every new platform has to
add this to their kernel commandline parameters. Change it to be on by
default.

In theory we could remove the parameter altogether: updated versions of
Chrome OS containing a kernel with this change would also be coupled
with firmware that behaves properly with these commands. Eventually we
should probably do that. For now, convert this to an opt-out parameter
so there's an emergency valve for people who are deliberately running
old firmware, or as an escape hatch in case of unforeseen regressions.

Signed-off-by: Evan Green <evgreen@chromium.org>
Link: https://lore.kernel.org/r/20210401140430.1.Ie141e6044d9b0d5aba72cb08857fdb43660c54d3@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomux: gpio: Simplify code by using dev_err_probe()
Andy Shevchenko [Tue, 30 Mar 2021 19:33:25 +0000 (22:33 +0300)]
mux: gpio: Simplify code by using dev_err_probe()

Use already prepared dev_err_probe() introduced by the commit
a787e5400a1c ("driver core: add device probe log helper").
It simplifies EPROBE_DEFER handling.

Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210330193325.68362-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomux: gpio: Make it OF independent
Andy Shevchenko [Tue, 30 Mar 2021 19:33:24 +0000 (22:33 +0300)]
mux: gpio: Make it OF independent

Module doesn't use OF APIs anyhow, make it OF independent by replacing
headers and dropping useless of_match_ptr() call.

Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210330193325.68362-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomux: gpio: Use bitmap API instead of direct assignment
Andy Shevchenko [Tue, 30 Mar 2021 19:33:23 +0000 (22:33 +0300)]
mux: gpio: Use bitmap API instead of direct assignment

Assigning bitmaps like it's done in the driver might be error prone.
Fix this by using bitmap API.

Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210330193325.68362-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agonvmem: qfprom: Add support for fuse blowing on sc7280
Rajendra Nayak [Tue, 30 Mar 2021 11:12:41 +0000 (12:12 +0100)]
nvmem: qfprom: Add support for fuse blowing on sc7280

Handle the differences across LDO voltage needed for blowing fuses,
and the blow timer value, identified using a minor version of 15
on sc7280.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Ravi Kumar Bokka <rbokka@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-11-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agodt-bindings: nvmem: Add SoC compatible for sc7280
Rajendra Nayak [Tue, 30 Mar 2021 11:12:40 +0000 (12:12 +0100)]
dt-bindings: nvmem: Add SoC compatible for sc7280

Document SoC compatible for sc7280

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-10-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agonvmem: rmem: fix undefined reference to memremap
Srinivas Kandagatla [Tue, 30 Mar 2021 11:12:39 +0000 (12:12 +0100)]
nvmem: rmem: fix undefined reference to memremap

Fix below error reporte by kernel test robot
rmem.c:(.text+0x14e): undefined reference to memremap
s390x-linux-gnu-ld: rmem.c:(.text+0x1b6): undefined reference to memunmap

Fixes: 5a3fa75a4d9c ("nvmem: Add driver to expose reserved memory as nvmem")
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-9-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agonvmem: core: Fix unintentional sign extension issue
Colin Ian King [Tue, 30 Mar 2021 11:12:38 +0000 (12:12 +0100)]
nvmem: core: Fix unintentional sign extension issue

The shifting of the u8 integer buf[3] by 24 bits to the left will
be promoted to a 32 bit signed int and then sign-extended to a
u64. In the event that the top bit of buf[3] is set then all
then all the upper 32 bits of the u64 end up as also being set
because of the sign-extension. Fix this by casting buf[i] to
a u64 before the shift.

Fixes: a28e824fb827 ("nvmem: core: Add functions to make number reading easy")
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Addresses-Coverity: ("Unintended sign extension")
Link: https://lore.kernel.org/r/20210330111241.19401-8-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agonvmem: core: Add functions to make number reading easy
Douglas Anderson [Tue, 30 Mar 2021 11:12:37 +0000 (12:12 +0100)]
nvmem: core: Add functions to make number reading easy

Sometimes the clients of nvmem just want to get a number out of
nvmem. They don't want to think about exactly how many bytes the nvmem
cell took up. They just want the number. Let's make it easy.

In general this concept is useful because nvmem space is precious and
usually the fewest bits are allocated that will hold a given value on
a given system. However, even though small numbers might be fine on
one system that doesn't mean that logically the number couldn't be
bigger. Imagine nvmem containing a max frequency for a component. On
one system perhaps that fits in 16 bits. On another system it might
fit in 32 bits. The code reading this number doesn't care--it just
wants the number.

We'll provide two functions: nvmem_cell_read_variable_le_u32() and
nvmem_cell_read_variable_le_u64().

Comparing these to the existing functions like nvmem_cell_read_u32():
* These new functions have no problems if the value was stored in
  nvmem in fewer bytes. It's OK to use these function as long as the
  value stored will fit in 32-bits (or 64-bits).
* These functions avoid problems that the earlier APIs had with bit
  offsets. For instance, you can't use nvmem_cell_read_u32() to read a
  value has nbits=32 and bit_offset=4 because the nvmem cell must be
  at least 5 bytes big to hold this value. The new API accounts for
  this and works fine.
* These functions make it very explicit that they assume that the
  number was stored in little endian format. The old functions made
  this assumption whenever bit_offset was non-zero (see
  nvmem_shift_read_buffer_in_place()) but didn't whenever the
  bit_offset was zero.

NOTE: it's assumed that we don't need an 8-bit or 16-bit version of
this function. The 32-bit version of the function can be used to read
8-bit or 16-bit data.

At the moment, I'm only adding the "unsigned" versions of these
functions, but if it ends up being useful someone could add a "signed"
version that did 2's complement sign extension.

At the moment, I'm only adding the "little endian" versions of these
functions. Adding the "big endian" version would require adding "big
endian" support to nvmem_shift_read_buffer_in_place().

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-7-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agonvmem: brcm_nvram: new driver exposing Broadcom's NVRAM
Rafał Miłecki [Tue, 30 Mar 2021 11:12:36 +0000 (12:12 +0100)]
nvmem: brcm_nvram: new driver exposing Broadcom's NVRAM

This driver provides access to Broadcom's NVRAM.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-6-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agodt-bindings: nvmem: add Broadcom's NVRAM
Rafał Miłecki [Tue, 30 Mar 2021 11:12:35 +0000 (12:12 +0100)]
dt-bindings: nvmem: add Broadcom's NVRAM

Broadcom's NVRAM structure contains device data and can be accessed
using I/O mapping.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agodrivers: nvmem: Fix voltage settings for QTI qfprom-efuse
Ravi Kumar Bokka [Tue, 30 Mar 2021 11:12:34 +0000 (12:12 +0100)]
drivers: nvmem: Fix voltage settings for QTI qfprom-efuse

QFPROM controller hardware requires 1.8V min for fuse blowing.
So, this change sets the voltage to 1.8V, required to blow the fuse
for qfprom-efuse controller.

To disable fuse blowing, we set the voltage to 0V since this may
be a shared rail and may be able to run at a lower rate when we're
not blowing fuses.

Fixes: 93b4e49f8c86 ("nvmem: qfprom: Add fuse blowing support")
Reported-by: Douglas Anderson <dianders@chromium.org>
Suggested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Ravi Kumar Bokka <rbokka@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agonvmem: convert comma to semicolon
Zheng Yongjun [Tue, 30 Mar 2021 11:12:33 +0000 (12:12 +0100)]
nvmem: convert comma to semicolon

Replace a comma between expression statements by a semicolon.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agodt-bindings: nvmem: mediatek: add support for MediaTek mt8192 SoC
Ryan Wu [Tue, 30 Mar 2021 11:12:32 +0000 (12:12 +0100)]
dt-bindings: nvmem: mediatek: add support for MediaTek mt8192 SoC

This updates dt-binding documentation for MediaTek mt8192

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ryan Wu <Yz.Wu@mediatek.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210330111241.19401-2-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agodrivers: most: use LIST_HEAD() for list_head
Shixin Liu [Mon, 29 Mar 2021 09:40:15 +0000 (17:40 +0800)]
drivers: most: use LIST_HEAD() for list_head

There's no need to declare a list and then init it manually,
just use the LIST_HEAD() macro.

Signed-off-by: Shixin Liu <liushixin2@huawei.com>
Link: https://lore.kernel.org/r/20210329094015.66942-2-liushixin2@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agodrivers: most: use DEFINE_SPINLOCK() for spinlock
Shixin Liu [Mon, 29 Mar 2021 09:40:14 +0000 (17:40 +0800)]
drivers: most: use DEFINE_SPINLOCK() for spinlock

spinlock can be initialized automatically with DEFINE_SPINLOCK()
rather than explicitly calling spin_lock_init().

Signed-off-by: Shixin Liu <liushixin2@huawei.com>
Link: https://lore.kernel.org/r/20210329094015.66942-1-liushixin2@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoMAINTAINERS: Update entry for ibmvmc driver
Brad Warrum [Tue, 30 Mar 2021 21:22:38 +0000 (16:22 -0500)]
MAINTAINERS: Update entry for ibmvmc driver

Steve Royer has moved on to a different project and has asked
that Ritu and I take over maintainership of the IBM Power
Virtual Management Channel Driver.

Signed-off-by: Brad Warrum <bwarrum@linux.ibm.com>
Acked-by: Steven Royer <seroyer@linux.ibm.com>
Link: https://lore.kernel.org/r/20210330212238.2747-1-bwarrum@linux.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agogreybus: remove stray nul byte in apb_log_enable_read output
Rasmus Villemoes [Fri, 26 Mar 2021 15:22:54 +0000 (16:22 +0100)]
greybus: remove stray nul byte in apb_log_enable_read output

Including a nul byte in the otherwise human-readable ascii output
from this debugfs file is probably not intended.

Acked-by: Alex Elder <elder@linaro.org>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20210326152254.733066-1-linux@rasmusvillemoes.dk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomisc: hpilo: MAINTAINERS: add entry for hpilo
Matt Hsiao [Mon, 29 Mar 2021 02:53:52 +0000 (10:53 +0800)]
misc: hpilo: MAINTAINERS: add entry for hpilo

The original maintainer left the company, add myself as the successor.

Signed-off-by: Matt Hsiao <matt.hsiao@hpe.com>
Link: https://lore.kernel.org/r/20210329025352.21485-1-matt.hsiao@hpe.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomisc/pvpanic: Make some symbols static
YueHaibing [Wed, 31 Mar 2021 12:17:06 +0000 (20:17 +0800)]
misc/pvpanic: Make some symbols static

Fix sparse warnings:

drivers/misc/pvpanic/pvpanic.c:28:18: warning:
 symbol 'pvpanic_list' was not declared. Should it be static?
drivers/misc/pvpanic/pvpanic.c:29:12: warning:
 symbol 'pvpanic_lock' was not declared. Should it be static?

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20210331121706.15268-1-yuehaibing@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agomisc/pvpanic: fix return value check in pvpanic_pci_probe()
Qiheng Lin [Tue, 30 Mar 2021 01:36:59 +0000 (09:36 +0800)]
misc/pvpanic: fix return value check in pvpanic_pci_probe()

In case of error, the function pci_iomap() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qiheng Lin <linqiheng@huawei.com>
Link: https://lore.kernel.org/r/20210330013659.916-1-linqiheng@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
3 years agoriscv: Make NUMA depend on MMU
Kefeng Wang [Tue, 30 Mar 2021 13:25:31 +0000 (21:25 +0800)]
riscv: Make NUMA depend on MMU

NUMA is useless when NOMMU, and it leads some build error,
make it depend on MMU.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
3 years agoriscv: remove unneeded semicolon
Yang Li [Mon, 22 Mar 2021 08:38:36 +0000 (16:38 +0800)]
riscv: remove unneeded semicolon

Eliminate the following coccicheck warning:
./arch/riscv/mm/kasan_init.c:219:2-3: Unneeded semicolon

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
3 years agoriscv,entry: fix misaligned base for excp_vect_table
Zihao Yu [Wed, 17 Mar 2021 08:17:25 +0000 (16:17 +0800)]
riscv,entry: fix misaligned base for excp_vect_table

In RV64, the size of each entry in excp_vect_table is 8 bytes. If the
base of the table is not 8-byte aligned, loading an entry in the table
will raise a misaligned exception. Although such exception will be
handled by opensbi/bbl, this still causes performance degradation.

Signed-off-by: Zihao Yu <yuzihao@ict.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
3 years agoriscv: evaluate put_user() arg before enabling user access
Ben Dooks [Mon, 29 Mar 2021 09:57:49 +0000 (10:57 +0100)]
riscv: evaluate put_user() arg before enabling user access

The <asm/uaccess.h> header has a problem with put_user(a, ptr) if
the 'a' is not a simple variable, such as a function. This can lead
to the compiler producing code as so:

1: enable_user_access()
2: evaluate 'a' into register 'r'
3: put 'r' to 'ptr'
4: disable_user_acess()

The issue is that 'a' is now being evaluated with the user memory
protections disabled. So we try and force the evaulation by assigning
'x' to __val at the start, and hoping the compiler barriers in
 enable_user_access() do the job of ordering step 2 before step 1.

This has shown up in a bug where 'a' sleeps and thus schedules out
and loses the SR_SUM flag. This isn't sufficient to fully fix, but
should reduce the window of opportunity. The first instance of this
we found is in scheudle_tail() where the code does:

$ less -N kernel/sched/core.c

4263  if (current->set_child_tid)
4264         put_user(task_pid_vnr(current), current->set_child_tid);

Here, the task_pid_vnr(current) is called within the block that has
enabled the user memory access. This can be made worse with KASAN
which makes task_pid_vnr() a rather large call with plenty of
opportunity to sleep.

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Reported-by: syzbot+e74b94fe601ab9552d69@syzkaller.appspotmail.com
Suggested-by: Arnd Bergman <arnd@arndb.de>
--
Changes since v1:
- fixed formatting and updated the patch description with more info

Changes since v2:
- fixed commenting on __put_user() (schwab@linux-m68k.org)

Change since v3:
- fixed RFC in patch title. Should be ready to merge.

Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
3 years agoriscv: Drop const annotation for sp
Kefeng Wang [Wed, 17 Mar 2021 15:08:38 +0000 (23:08 +0800)]
riscv: Drop const annotation for sp

The const annotation should not be used for 'sp', or it will
become read only and lead to bad stack output.

Fixes: dec822771b01 ("riscv: stacktrace: Move register keyword to beginning of declaration")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
3 years agoMerge tag 'lto-v5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux
Linus Torvalds [Fri, 2 Apr 2021 00:57:43 +0000 (17:57 -0700)]
Merge tag 'lto-v5.12-rc6' of git://git./linux/kernel/git/kees/linux

Pull LTO fix from Kees Cook:
 "It seems that there is a bug in ld.bfd when doing module section
  merging.

  As explicit merging is only needed for LTO, the work-around is to only
  do it under LTO, leaving the original section layout choices alone
  under normal builds:

   - Only perform explicit module section merges under LTO (Sean
     Christopherson)"

* tag 'lto-v5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  kbuild: lto: Merge module sections if and only if CONFIG_LTO_CLANG is enabled

3 years agokbuild: lto: Merge module sections if and only if CONFIG_LTO_CLANG is enabled
Sean Christopherson [Mon, 22 Mar 2021 23:44:38 +0000 (16:44 -0700)]
kbuild: lto: Merge module sections if and only if CONFIG_LTO_CLANG is enabled

Merge module sections only when using Clang LTO. With ld.bfd, merging
sections does not appear to update the symbol tables for the module,
e.g. 'readelf -s' shows the value that a symbol would have had, if
sections were not merged. ld.lld does not show this problem.

The stale symbol table breaks gdb's function disassembler, and presumably
other things, e.g.

  gdb -batch -ex "file arch/x86/kvm/kvm.ko" -ex "disassemble kvm_init"

reads the wrong bytes and dumps garbage.

Fixes: dd2776222abb ("kbuild: lto: merge module sections")
Cc: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210322234438.502582-1-seanjc@google.com
3 years agoMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Linus Torvalds [Thu, 1 Apr 2021 19:42:55 +0000 (12:42 -0700)]
Merge tag 'for-linus' of git://git./virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "It's a bit larger than I (and probably you) would like by the time we
  get to -rc6, but perhaps not entirely unexpected since the changes in
  the last merge window were larger than usual.

  x86:
   - Fixes for missing TLB flushes with TDP MMU

   - Fixes for race conditions in nested SVM

   - Fixes for lockdep splat with Xen emulation

   - Fix for kvmclock underflow

   - Fix srcdir != builddir builds

   - Other small cleanups

  ARM:
   - Fix GICv3 MMIO compatibility probing

   - Prevent guests from using the ARMv8.4 self-hosted tracing
     extension"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  selftests: kvm: Check that TSC page value is small after KVM_SET_CLOCK(0)
  KVM: x86: Prevent 'hv_clock->system_time' from going negative in kvm_guest_time_update()
  KVM: x86: disable interrupts while pvclock_gtod_sync_lock is taken
  KVM: x86: reduce pvclock_gtod_sync_lock critical sections
  KVM: SVM: ensure that EFER.SVME is set when running nested guest or on nested vmexit
  KVM: SVM: load control fields from VMCB12 before checking them
  KVM: x86/mmu: Don't allow TDP MMU to yield when recovering NX pages
  KVM: x86/mmu: Ensure TLBs are flushed for TDP MMU during NX zapping
  KVM: x86/mmu: Ensure TLBs are flushed when yielding during GFN range zap
  KVM: make: Fix out-of-source module builds
  selftests: kvm: make hardware_disable_test less verbose
  KVM: x86/vPMU: Forbid writing to MSR_F15H_PERF MSRs when guest doesn't have X86_FEATURE_PERFCTR_CORE
  KVM: x86: remove unused declaration of kvm_write_tsc()
  KVM: clean up the unused argument
  tools/kvm_stat: Add restart delay
  KVM: arm64: Fix CPU interface MMIO compatibility detection
  KVM: arm64: Disable guest access to trace filter controls
  KVM: arm64: Hide system instruction access to Trace registers

3 years agoMerge tag 'drm-fixes-2021-04-02' of git://anongit.freedesktop.org/drm/drm
Linus Torvalds [Thu, 1 Apr 2021 19:19:03 +0000 (12:19 -0700)]
Merge tag 'drm-fixes-2021-04-02' of git://anongit.freedesktop.org/drm/drm

Pull drm fixes from Dave Airlie:
 "Things have settled down in time for Easter, a random smattering of
  small fixes across a few drivers.

  I'm guessing though there might be some i915 and misc fixes out there
  I haven't gotten yet, but since today is a public holiday here, I'm
  sending this early so I can have the day off, I'll see if more
  requests come in and decide what to do with them later.

  amdgpu:
   - Polaris idle power fix
   - VM fix
   - Vangogh S3 fix
   - Fixes for non-4K page sizes

  amdkfd:
   - dqm fence memory corruption fix

  tegra:
   - lockdep warning fix
   - runtine PM reference fix
   - display controller fix
   - PLL Fix

  imx:
   - memory leak in error path fix
   - LDB driver channel registration fix
   - oob array warning in LDB driver

  exynos
   - unused header file removal"

* tag 'drm-fixes-2021-04-02' of git://anongit.freedesktop.org/drm/drm:
  drm/amdgpu: check alignment on CPU page for bo map
  drm/amdgpu: Set a suitable dev_info.gart_page_size
  drm/amdgpu/vangogh: don't check for dpm in is_dpm_running when in suspend
  drm/amdkfd: dqm fence memory corruption
  drm/tegra: sor: Grab runtime PM reference across reset
  drm/tegra: dc: Restore coupling of display controllers
  gpu: host1x: Use different lock classes for each client
  drm/tegra: dc: Don't set PLL clock to 0Hz
  drm/amdgpu: fix offset calculation in amdgpu_vm_bo_clear_mappings()
  drm/amd/pm: no need to force MCLK to highest when no display connected
  drm/exynos/decon5433: Remove the unused include statements
  drm/imx: imx-ldb: fix out of bounds array access warning
  drm/imx: imx-ldb: Register LDB channel1 when it is the only channel to be used
  drm/imx: fix memory leak when fails to init

3 years agoMerge tag 'imx-drm-fixes-2021-04-01' of git://git.pengutronix.de/git/pza/linux into...
Dave Airlie [Thu, 1 Apr 2021 18:52:45 +0000 (04:52 +1000)]
Merge tag 'imx-drm-fixes-2021-04-01' of git://git.pengutronix.de/git/pza/linux into drm-fixes

drm/imx: imx-drm-core and imx-ldb fixes

Fix a memory leak in an error path during DRM device initialization,
fix the LDB driver to register channel 1 even if channel 0 is unused,
and fix an out of bounds array access warning in the LDB driver.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210401092235.GA13586@pengutronix.de
3 years agoMerge tag 'drm/tegra/for-5.12-rc6' of ssh://git.freedesktop.org/git/tegra/linux into...
Dave Airlie [Thu, 1 Apr 2021 18:44:28 +0000 (04:44 +1000)]
Merge tag 'drm/tegra/for-5.12-rc6' of ssh://git.freedesktop.org/git/tegra/linux into drm-fixes

drm/tegra: Fixes for v5.12-rc6

This contains a couple of fixes for various issues such as lockdep
warnings, runtime PM references, coupled display controllers and
misconfigured PLLs.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Thierry Reding <thierry.reding@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210401163352.3348296-1-thierry.reding@gmail.com
3 years agotracing: Fix stack trace event size
Steven Rostedt (VMware) [Thu, 1 Apr 2021 17:54:40 +0000 (13:54 -0400)]
tracing: Fix stack trace event size

Commit cbc3b92ce037 fixed an issue to modify the macros of the stack trace
event so that user space could parse it properly. Originally the stack
trace format to user space showed that the called stack was a dynamic
array. But it is not actually a dynamic array, in the way that other
dynamic event arrays worked, and this broke user space parsing for it. The
update was to make the array look to have 8 entries in it. Helper
functions were added to make it parse it correctly, as the stack was
dynamic, but was determined by the size of the event stored.

Although this fixed user space on how it read the event, it changed the
internal structure used for the stack trace event. It changed the array
size from [0] to [8] (added 8 entries). This increased the size of the
stack trace event by 8 words. The size reserved on the ring buffer was the
size of the stack trace event plus the number of stack entries found in
the stack trace. That commit caused the amount to be 8 more than what was
needed because it did not expect the caller field to have any size. This
produced 8 entries of garbage (and reading random data) from the stack
trace event:

          <idle>-0       [002] d... 1976396.837549: <stack trace>
 => trace_event_raw_event_sched_switch
 => __traceiter_sched_switch
 => __schedule
 => schedule_idle
 => do_idle
 => cpu_startup_entry
 => secondary_startup_64_no_verify
 => 0xc8c5e150ffff93de
 => 0xffff93de
 => 0
 => 0
 => 0xc8c5e17800000000
 => 0x1f30affff93de
 => 0x00000004
 => 0x200000000

Instead, subtract the size of the caller field from the size of the event
to make sure that only the amount needed to store the stack trace is
reserved.

Link: https://lore.kernel.org/lkml/your-ad-here.call-01617191565-ext-9692@work.hours/
Cc: stable@vger.kernel.org
Fixes: cbc3b92ce037 ("tracing: Set kernel_stack's caller size properly")
Reported-by: Vasily Gorbik <gor@linux.ibm.com>
Tested-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
3 years agoMerge tag 'sound-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Thu, 1 Apr 2021 17:09:31 +0000 (10:09 -0700)]
Merge tag 'sound-5.12-rc6' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "Things seem calming down, only usual device-specific fixes for
  HD-audio and USB-audio at this time"

* tag 'sound-5.12-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda/realtek: fix mute/micmute LEDs for HP 640 G8
  ALSA: hda: Add missing sanity checks in PM prepare/complete callbacks
  ALSA: hda: Re-add dropped snd_poewr_change_state() calls
  ALSA: usb-audio: Apply sample rate quirk to Logitech Connect
  ALSA: hda/realtek: call alc_update_headset_mode() in hp_automute_hook
  ALSA: hda/realtek: fix a determine_headset_type issue for a Dell AIO

3 years agoMerge tag 'tomoyo-pr-20210401' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1
Linus Torvalds [Thu, 1 Apr 2021 16:39:51 +0000 (09:39 -0700)]
Merge tag 'tomoyo-pr-20210401' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1

Pull tomory fix from Tetsuo Handa:
 "An update on 'tomoyo: recognize kernel threads correctly' from Jens
  Axboe to not special case PF_IO_WORKER for PF_KTHREAD"

* tag 'tomoyo-pr-20210401' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1:
  tomoyo: don't special case PF_IO_WORKER for PF_KTHREAD

3 years agoMerge tag 'xarray-5.12' of git://git.infradead.org/users/willy/xarray
Linus Torvalds [Thu, 1 Apr 2021 16:32:18 +0000 (09:32 -0700)]
Merge tag 'xarray-5.12' of git://git.infradead.org/users/willy/xarray

Pull XArray fixes from Matthew Wilcox:
 "My apologies for the lateness of this. I had a bug reported in the
  test suite, and when I started working on it, I realised I had two
  fixes sitting in the xarray tree since last November. Anyway,
  everything here is fixes, apart from adding xa_limit_16b. The test
  suite passes.

  Summary:

   - Fix a bug when splitting to a non-zero order

   - Documentation fix

   - Add a predefined 16-bit allocation limit

   - Various test suite fixes"

* tag 'xarray-5.12' of git://git.infradead.org/users/willy/xarray:
  idr test suite: Improve reporting from idr_find_test_1
  idr test suite: Create anchor before launching throbber
  idr test suite: Take RCU read lock in idr_find_test_1
  radix tree test suite: Register the main thread with the RCU library
  radix tree test suite: Fix compilation
  XArray: Add xa_limit_16b
  XArray: Fix splitting to non-zero orders
  XArray: Fix split documentation

3 years agoio_uring: fix EIOCBQUEUED iter revert
Pavel Begunkov [Thu, 1 Apr 2021 11:18:48 +0000 (12:18 +0100)]
io_uring: fix EIOCBQUEUED iter revert

iov_iter_revert() is done in completion handlers that happensf before
read/write returns -EIOCBQUEUED, no need to repeat reverting afterwards.
Moreover, even though it may appear being just a no-op, it's actually
races with 1) user forging a new iovec of a different size 2) reissue,
that is done via io-wq continues completely asynchronously.

Fixes: 3e6a0d3c7571c ("io_uring: fix -EAGAIN retry with IOPOLL")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoio_uring/io-wq: protect against sprintf overflow
Pavel Begunkov [Thu, 1 Apr 2021 08:55:04 +0000 (09:55 +0100)]
io_uring/io-wq: protect against sprintf overflow

task_pid may be large enough to not fit into the left space of
TASK_COMM_LEN-sized buffers and overflow in sprintf. We not so care
about uniqueness, so replace it with safer snprintf().

Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1702c6145d7e1c46fbc382f28334c02e1a3d3994.1617267273.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoio_uring: don't mark S_ISBLK async work as unbounded
Jens Axboe [Thu, 1 Apr 2021 14:38:34 +0000 (08:38 -0600)]
io_uring: don't mark S_ISBLK async work as unbounded

S_ISBLK is marked as unbounded work for async preparation, because it
doesn't match S_ISREG. That is incorrect, as any read/write to a block
device is also a bounded operation. Fix it up and ensure that S_ISBLK
isn't marked unbounded.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agonull_blk: fix command timeout completion handling
Damien Le Moal [Wed, 31 Mar 2021 22:52:44 +0000 (07:52 +0900)]
null_blk: fix command timeout completion handling

Memory backed or zoned null block devices may generate actual request
timeout errors due to the submission path being blocked on memory
allocation or zone locking. Unlike fake timeouts or injected timeouts,
the request submission path will call blk_mq_complete_request() or
blk_mq_end_request() for these real timeout errors, causing a double
completion and use after free situation as the block layer timeout
handler executes blk_mq_rq_timed_out() and __blk_mq_free_request() in
blk_mq_check_expired(). This problem often triggers a NULL pointer
dereference such as:

BUG: kernel NULL pointer dereference, address: 0000000000000050
RIP: 0010:blk_mq_sched_mark_restart_hctx+0x5/0x20
...
Call Trace:
  dd_finish_request+0x56/0x80
  blk_mq_free_request+0x37/0x130
  null_handle_cmd+0xbf/0x250 [null_blk]
  ? null_queue_rq+0x67/0xd0 [null_blk]
  blk_mq_dispatch_rq_list+0x122/0x850
  __blk_mq_do_dispatch_sched+0xbb/0x2c0
  __blk_mq_sched_dispatch_requests+0x13d/0x190
  blk_mq_sched_dispatch_requests+0x30/0x60
  __blk_mq_run_hw_queue+0x49/0x90
  process_one_work+0x26c/0x580
  worker_thread+0x55/0x3c0
  ? process_one_work+0x580/0x580
  kthread+0x134/0x150
  ? kthread_create_worker_on_cpu+0x70/0x70
  ret_from_fork+0x1f/0x30

This problem very often triggers when running the full btrfs xfstests
on a memory-backed zoned null block device in a VM with limited amount
of memory.

Avoid this by executing blk_mq_complete_request() in null_timeout_rq()
only for commands that are marked for a fake timeout completion using
the fake_timeout boolean in struct null_cmd. For timeout errors injected
through debugfs, the timeout handler will execute
blk_mq_complete_request()i as before. This is safe as the submission
path does not execute complete requests in this case.

In null_timeout_rq(), also make sure to set the command error field to
BLK_STS_TIMEOUT and to propagate this error through to the request
completion.

Reported-by: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Tested-by: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Reviewed-by: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20210331225244.126426-1-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
3 years agoidr test suite: Improve reporting from idr_find_test_1
Matthew Wilcox (Oracle) [Thu, 1 Apr 2021 11:50:42 +0000 (07:50 -0400)]
idr test suite: Improve reporting from idr_find_test_1

Instead of just reporting an assertion failure, report enough information
that we can start diagnosing exactly went wrong.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
3 years agoidr test suite: Create anchor before launching throbber
Matthew Wilcox (Oracle) [Thu, 1 Apr 2021 11:46:49 +0000 (07:46 -0400)]
idr test suite: Create anchor before launching throbber

The throbber could race with creation of the anchor entry and cause the
IDR to have zero entries in it, which would cause the test to fail.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
3 years agoidr test suite: Take RCU read lock in idr_find_test_1
Matthew Wilcox (Oracle) [Thu, 1 Apr 2021 11:44:48 +0000 (07:44 -0400)]
idr test suite: Take RCU read lock in idr_find_test_1

When run on a single CPU, this test would frequently access already-freed
memory.  Due to timing, this bug never showed up on multi-CPU tests.

Reported-by: Chris von Recklinghausen <crecklin@redhat.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
3 years agoradix tree test suite: Register the main thread with the RCU library
Matthew Wilcox (Oracle) [Wed, 31 Mar 2021 18:59:19 +0000 (14:59 -0400)]
radix tree test suite: Register the main thread with the RCU library

Several test runners register individual worker threads with the
RCU library, but neglect to register the main thread, which can lead
to objects being freed while the main thread is in what appears to be
an RCU critical section.

Reported-by: Chris von Recklinghausen <crecklin@redhat.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
3 years agoACPI: processor: Fix CPU0 wakeup in acpi_idle_play_dead()
Vitaly Kuznetsov [Wed, 24 Mar 2021 15:22:19 +0000 (16:22 +0100)]
ACPI: processor: Fix CPU0 wakeup in acpi_idle_play_dead()

Commit 496121c02127 ("ACPI: processor: idle: Allow probing on platforms
with one ACPI C-state") broke CPU0 hotplug on certain systems, e.g.
I'm observing the following on AWS Nitro (e.g r5b.xlarge but other
instance types are affected as well):

 # echo 0 > /sys/devices/system/cpu/cpu0/online
 # echo 1 > /sys/devices/system/cpu/cpu0/online
 <10 seconds delay>
 -bash: echo: write error: Input/output error

In fact, the above mentioned commit only revealed the problem and did
not introduce it. On x86, to wakeup CPU an NMI is being used and
hlt_play_dead()/mwait_play_dead() loops are prepared to handle it:

/*
 * If NMI wants to wake up CPU0, start CPU0.
 */
if (wakeup_cpu0())
start_cpu0();

cpuidle_play_dead() -> acpi_idle_play_dead() (which is now being called on
systems where it wasn't called before the above mentioned commit) serves
the same purpose but it doesn't have a path for CPU0. What happens now on
wakeup is:
 - NMI is sent to CPU0
 - wakeup_cpu0_nmi() works as expected
 - we get back to while (1) loop in acpi_idle_play_dead()
 - safe_halt() puts CPU0 to sleep again.

The straightforward/minimal fix is add the special handling for CPU0 on x86
and that's what the patch is doing.

Fixes: 496121c02127 ("ACPI: processor: idle: Allow probing on platforms with one ACPI C-state")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: 5.10+ <stable@vger.kernel.org> # 5.10+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>