linux-2.6-microblaze.git
14 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6
Linus Torvalds [Tue, 10 Aug 2010 22:03:42 +0000 (15:03 -0700)]
Merge git://git./linux/kernel/git/gregkh/tty-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (68 commits)
  U6715 16550A serial driver support
  Char: nozomi, set tty->driver_data appropriately
  Char: nozomi, fix tty->count counting
  serial: max3107: Fix gpiolib support
  hsu: call PCI pm hooks in suspend/resume function
  hsu: some code cleanup
  hsu: add a periodic timer to check dma rx channel
  hsu: driver for Medfield High Speed UART device
  mxser: remove unnesesary NULL check
  serial: add support for OX16PCI958 card
  serial: 68328serial.c: remove dead (ALMA_ANS | DRAGONIXVZ | M68EZ328ADS)
  timbuart: use __devinit and __devexit macros for probe and remove
  serial: MMIO32 support for 8250_early.c
  serial: mcf: don't take spinlocks in already protected functions
  serial: general fixes in the serial_rs485 structure
  serial: fix missing bit coverage of ASYNC_FLAGS
  serial: "altera_uart: simplify altera_uart_console_putc()" checkpatch fixes
  serial: crisv10: formatting of pointers in printk()
  vt: Fix warning: statement with no effect due to vt_kern.h
  tty_io: remove casts from void*
  ...

14 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux...
Linus Torvalds [Tue, 10 Aug 2010 21:13:35 +0000 (14:13 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/geert/linux-m68k

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  zorro: Fix reading of proc/bus/zorro/* in small chunks
  zorro: BKL removal
  m68k/mac: Fix RTC on PMU machines
  m68k/mac: Add color classic ii support
  arch/m68k/sun3/leds.c: Checkpatch cleanup

14 years agoMerge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6
Linus Torvalds [Tue, 10 Aug 2010 21:01:26 +0000 (14:01 -0700)]
Merge branch 'for-linus' of git://git390.marist.edu/linux-2.6

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] dasd: tunable missing interrupt handler
  [S390] dasd: allocate fallback cqr for reserve/release
  [S390] topology: use default MC domain initializer
  [S390] initrd: change default load address
  [S390] cmm, smsgiucv_app: convert sender to uppercase
  [S390] cmm: add missing __init/__exit annotations
  [S390] cio: use all available paths for some internal I/O
  [S390] ccwreq: add ability to use all paths
  [S390] cio: ccw_device_online_store return -EINVAL in case of missing driver
  [S390] cio: Log the response from the unit check handler
  [S390] cio: CHSC SIOSL Support

14 years agoMerge branch 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic...
Linus Torvalds [Tue, 10 Aug 2010 20:58:28 +0000 (13:58 -0700)]
Merge branch 'bkl/ioctl' of git://git./linux/kernel/git/frederic/random-tracing

* 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing:
  staging: Pushdown bkl to easycap ioctl handlers
  autofs/autofs4: Move compat_ioctl handling into fs
  v4l: Convert v4l2-dev to unlocked_ioctl
  ia64/perfmon: Convert to unlocked_ioctl
  sunrpc: Remove duplicated #include
  ncpfs: Remove duplicated #include

14 years agoMerge branch 'kmemleak' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
Linus Torvalds [Tue, 10 Aug 2010 20:58:11 +0000 (13:58 -0700)]
Merge branch 'kmemleak' of git://git./linux/kernel/git/cmarinas/linux-2.6-cm

* 'kmemleak' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-2.6-cm:
  kmemleak: Fix typo in the comment
  lib/scatterlist: Hook sg_kmalloc into kmemleak (v2)
  kmemleak: Add DocBook style comments to kmemleak.c
  kmemleak: Introduce a default off mode for kmemleak
  kmemleak: Show more information for objects found by alias

14 years agoU6715 16550A serial driver support
Philippe Langlais [Thu, 29 Jul 2010 15:13:57 +0000 (17:13 +0200)]
U6715 16550A serial driver support

UART Features extract from STEricsson U6715 data-sheet (arm926 SoC for mobile phone):
* Fully compatible with industry standard 16C550 and 16C450 from various
manufacturers
* RX and TX 64 byte FIFO reduces CPU interrupts
* Full double buffering
* Modem control signals include CTS, RTS, (and DSR, DTR on UART1 only)
* Automatic baud rate selection
* Manual or automatic RTS/CTS smart hardware flow control
* Programmable serial characteristics:
– Baud rate generation (50 to 3.25M baud)
– 5, 6, 7 or 8-bit characters
– Even, odd or no-parity bit generation and detection
– 1, 1.5 or 2 stop bit generation
* Independent control of transmit, receive, line status, data set interrupts and FIFOs
* Full status-reporting capabilities
* Separate DMA signaling for RX and TX
* Timed interrupt to spread receive interrupt on known duration
* DMA time-out interrupt to allow detection of end of reception
* Carkit pulse coding and decoding compliant with USB carkit control interface [40]

In 16550A auto-configuration, if the fifo size is 64 then it's an U6 16550A port
Add set_termios hook & export serial8250_do_set_termios to change uart
clock following baudrate

Signed-off-by: Philippe Langlais <philippe.langlais@stericsson.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoChar: nozomi, set tty->driver_data appropriately
Jiri Slaby [Thu, 29 Jul 2010 09:46:32 +0000 (11:46 +0200)]
Char: nozomi, set tty->driver_data appropriately

Sorry, one more fix, this one depends on the other, so this is rather 2/2.
--

tty->driver_data is used all over the code, but never set. This
results in oopses like:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000130
IP: [<ffffffff814a0040>] mutex_lock+0x10/0x40
...
Pid: 2157, comm: modem-manager Not tainted 2.6.34.1-0.1-desktop #1 2768DR7/2768DR7
RIP: 0010:[<ffffffff814a0040>]  [<ffffffff814a0040>] mutex_lock+0x10/0x40
RSP: 0018:ffff88007b16fa50  EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000130 RCX: 0000000000000003
RDX: 0000000000000003 RSI: 0000000000000286 RDI: 0000000000000130
RBP: 0000000000001000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000130
R13: 0000000000000001 R14: 0000000000000000 R15: ffff88007b16feb4
...
Call Trace:
 [<ffffffffa077690d>] ntty_write_room+0x4d/0x90 [nozomi]
...

Set tty->driver_data to the computed port in .install to not recompute it in
every place where needed. Switch .open to use driver_data too.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org> [.34, .35]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoChar: nozomi, fix tty->count counting
Jiri Slaby [Thu, 29 Jul 2010 09:09:47 +0000 (11:09 +0200)]
Char: nozomi, fix tty->count counting

Currently ntty_install omits to increment tty count and we get the
following warnings:
Warning: dev (noz2) tty->count(0) != #fd's(1) in tty_open

So to fix that, add one tty->count++ there.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org> [.34, .35]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: max3107: Fix gpiolib support
Alan Cox [Tue, 27 Jul 2010 07:16:05 +0000 (08:16 +0100)]
serial: max3107: Fix gpiolib support

Because of the way gpiolib works we actually need to ifdef this in our
header file

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agohsu: call PCI pm hooks in suspend/resume function
Feng Tang [Tue, 27 Jul 2010 07:20:52 +0000 (08:20 +0100)]
hsu: call PCI pm hooks in suspend/resume function

Also add check for dma controller or the uart ports.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agohsu: some code cleanup
Feng Tang [Tue, 27 Jul 2010 07:20:42 +0000 (08:20 +0100)]
hsu: some code cleanup

Major changes are:
* refine the comments in the driver
* remove unused member from structure "hsu_port"
* extended spin_lock protoction for dma mode in port_irq()

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agohsu: add a periodic timer to check dma rx channel
Feng Tang [Tue, 27 Jul 2010 07:20:32 +0000 (08:20 +0100)]
hsu: add a periodic timer to check dma rx channel

A general problem for uart rx dma channel is you never know when
and how much data will be received, so usually preset it a DMA
descriptor with a big size, and rely on DMA RX timeout IRQ to
know there is some data in rx channel.

For a RX data size of multiple of MOTSR, there will be no timeout
IRQ issued, thus OS will never be notified about that.

This is a work around for that, current timer frequency is 5 times
per second, it should vary according to the baud rate

When future silicon version fix the problem, this workaround need
be removed

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agohsu: driver for Medfield High Speed UART device
Feng Tang [Tue, 27 Jul 2010 07:20:22 +0000 (08:20 +0100)]
hsu: driver for Medfield High Speed UART device

This is a PCI & UART driver, which suppors both PIO and DMA mode
UART operation. It has 3 identical UART ports and one internal
DMA controller.

Current FW will export 4 pci devices for hsu: 3 uart ports and 1
dma controller, each has one IRQ line. And we need to discuss the
device model, one PCI device covering whole HSU should be a better
model, but there is a problem of how to export the 4 IRQs info

Current driver set the highest baud rate to 2746800bps, which is
easy to scale down to 115200/230400.... To suport higher baud rate,
we need add special process, change DLAB/DLH/PS/DIV/MUL registers
all together.

921600 is the highest baud rate that has been tested with Bluetooth
modem connected to HSU port 0. Will test more when there is right
BT firmware.

Current version contains several work around for A0's Silicon bugs

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agomxser: remove unnesesary NULL check
Kulikov Vasiliy [Fri, 23 Jul 2010 16:34:53 +0000 (20:34 +0400)]
mxser: remove unnesesary NULL check

mxser_transmit_chars(tty, port) is called only from mxser_interrupt().
NULL check is performed in mxser_interrupt() so it is redundant here.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Acked-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: add support for OX16PCI958 card
Lytochkin Boris [Mon, 26 Jul 2010 06:02:26 +0000 (10:02 +0400)]
serial: add support for OX16PCI958 card

Signed-off-by: Lytochkin Boris <lytboris@gmail.com>
Tested-by: Lytochkin Boris <lytboris@gmail.com>
Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: 68328serial.c: remove dead (ALMA_ANS | DRAGONIXVZ | M68EZ328ADS)
Christoph Egger [Tue, 20 Jul 2010 22:26:54 +0000 (15:26 -0700)]
serial: 68328serial.c: remove dead (ALMA_ANS | DRAGONIXVZ | M68EZ328ADS)

(ALMA_ANS | DRAGONIXVZ | M68EZ328ADS) doesn't exist in Kconfig, therefore
remove all references to it from the source code.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotimbuart: use __devinit and __devexit macros for probe and remove
Richard Röjfors [Tue, 20 Jul 2010 22:26:53 +0000 (15:26 -0700)]
timbuart: use __devinit and __devexit macros for probe and remove

Move the probe and remove functions to the devinit and devexit sections.

Signed-off-by: Richard Röjfors <richard.rojfors@pelagicore.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: MMIO32 support for 8250_early.c
Samium Gromoff [Tue, 20 Jul 2010 22:26:51 +0000 (15:26 -0700)]
serial: MMIO32 support for 8250_early.c

Provide MMIO32 support in 8250_early (aka earlycon)

[randy.dunlap@oracle.com: fix printk format warnings]
[akpm@linux-foundation.org: fix printk args some more]
Signed-off-by: Samium Gromoff <_deepfire@feelingofgreen.ru>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: mcf: don't take spinlocks in already protected functions
Yury Georgievskiy [Tue, 20 Jul 2010 22:26:50 +0000 (15:26 -0700)]
serial: mcf: don't take spinlocks in already protected functions

Don't take the port spinlock in uart functions where the serial core
already takes care of locking/unlocking them.

The code would actually lock up on architectures where spinlocks are
implemented.

Also protect calling mcf_rx_chars/mcf_tx_chars in the interrupt handler by
the port spinlock and use IRQ_RETVAL to return from isr.

[akpm@linux-foundation.org: make irq-handler return value more explicit]
Signed-off-by: Yury Georgievskiy <ygeorgie@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: general fixes in the serial_rs485 structure
Claudio Scordino [Tue, 20 Jul 2010 22:26:47 +0000 (15:26 -0700)]
serial: general fixes in the serial_rs485 structure

Fix several issues related to the RS485 interface:

 - It adds the flag SER_RS485_RTS_BEFORE_SEND that was missing from the
   serial_rs485 structure (even if "delay_rts_before_send" was existing)

 - It adds a further "delay_rts_after_send" field for those drivers that
   can have a delay after send (e.g., atmel_serial)

 - It fixes the usage of the structure in the atmel_serial driver (where
   "delay_rts_before_send" should be used instead of "delay_rts_after_send").

Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Bernhard Roth <br@pwrnet.de>
Cc: Philippe De Muyter <phdm@macqel.be>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: fix missing bit coverage of ASYNC_FLAGS
John Villalovos [Tue, 20 Jul 2010 22:26:46 +0000 (15:26 -0700)]
serial: fix missing bit coverage of ASYNC_FLAGS

It seems that currently ASYNC_FLAGS is one bit short of covering all the
bits of the ASYNC user flags.  In particular it does not cover the
ASYNC_AUTOPROBE bit.

ASYNCB_LAST_USER and ASYNCB_AUTOPROBE are both equal to 15.

Therefore:
ASYNC_AUTOPROBE = 1000 0000 0000 0000
ASYNC_FLAGS     = 0111 1111 1111 1111

So ASYNC_FLAGS is not covering the ASYNC_AUTOPROBE bit.

This patch fixes the issue and with the patch the values will be:
ASYNC_AUTOPROBE = 1000 0000 0000 0000
ASYNC_FLAGS     = 1111 1111 1111 1111

As a side note, doing a "git grep" I didn't find any use of
ASYNC_AUTOPROBE or ASYNCB_AUTOPROBE in the kernel, besides this include
file.

Signed-off-by: John Villalovos <john.l.villalovos@intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: "altera_uart: simplify altera_uart_console_putc()" checkpatch fixes
Andrew Morton [Tue, 20 Jul 2010 22:26:10 +0000 (15:26 -0700)]
serial: "altera_uart: simplify altera_uart_console_putc()" checkpatch fixes

ERROR: code indent should use tabs where possible
#32: FILE: drivers/serial/altera_uart.c:397:
+^I         ALTERA_UART_STATUS_TRDY_MSK))$

total: 1 errors, 0 warnings, 39 lines checked

./patches/altera_uart-simplify-altera_uart_console_putc.patch has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

Please run checkpatch prior to sending patches

This fix got lost when someone merged "altera_uart: simplify
altera_uart_console_putc()".  Please don't lose fixes.  Please don't write
of mere patches which have trivial checkpatch errors.

Cc: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: crisv10: formatting of pointers in printk()
Kulikov Vasiliy [Wed, 14 Jul 2010 18:04:42 +0000 (22:04 +0400)]
serial: crisv10: formatting of pointers in printk()

Use %p instead of %08x in printk().

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agovt: Fix warning: statement with no effect due to vt_kern.h
Kevin Winchester [Sat, 10 Jul 2010 21:57:56 +0000 (18:57 -0300)]
vt: Fix warning: statement with no effect due to vt_kern.h

Using:

gcc (GCC) 4.5.0 20100610 (prerelease)

with CONFIG_CONSOLE_TRANSLATIONS=n, the following warnings are seen:

drivers/char/vt_ioctl.c: In function ‘vt_ioctl’:
drivers/char/vt_ioctl.c:1309:4: warning: statement with no effect
drivers/char/vt.c: In function ‘vc_allocate’:
drivers/char/vt.c:774:3: warning: statement with no effect
drivers/video/console/vgacon.c: In function ‘vgacon_init’:
drivers/video/console/vgacon.c:587:3: warning: statement with no effect
drivers/video/console/vgacon.c: In function ‘vgacon_deinit’:
drivers/video/console/vgacon.c:606:2: warning: statement with no effect
drivers/video/console/fbcon.c: In function ‘fbcon_init’:
drivers/video/console/fbcon.c:1087:3: warning: statement with no effect
drivers/video/console/fbcon.c:1089:3: warning: statement with no effect
drivers/video/console/fbcon.c: In function ‘fbcon_set_disp’:
drivers/video/console/fbcon.c:1369:3: warning: statement with no effect
drivers/video/console/fbcon.c:1371:3: warning: statement with no effect

This is because several functions in include/linux/vt_kern.h are
defined to (0).  Convert them to static inline functions to
silence the warnings and gain a bit of type safety.

Signed-off-by: Kevin Winchester <kjwinchester@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty_io: remove casts from void*
Kulikov Vasiliy [Tue, 29 Jun 2010 10:15:09 +0000 (14:15 +0400)]
tty_io: remove casts from void*

Remove unnesessary casts from void*.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: max3107: Abstract out the platform specific bits
Alan Cox [Wed, 30 Jun 2010 16:58:38 +0000 (17:58 +0100)]
serial: max3107: Abstract out the platform specific bits

At the moment there is only one platform type supported and there is is
hard wired, but with these changes the infrastructure is now there for
anyone else to provide methods for their hardware.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: max3107: introduce a max3107 driver
jianwei.yang [Wed, 30 Jun 2010 16:57:12 +0000 (17:57 +0100)]
serial: max3107: introduce a max3107 driver

This device is used by some of the Intel MID platforms. It's not similar
enough to the MAX3100 to use the same driver.

At this point the driver is specific to the platform and not generalised.
We will fix that later.

Signed-off-by: jianwei.yang <jianwei.yang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: avoid recursive BTM in pty_close
Arnd Bergmann [Fri, 18 Jun 2010 12:58:07 +0000 (14:58 +0200)]
tty: avoid recursive BTM in pty_close

When the console has been redirected, a hangup of the tty
will cause tty_release to be called under the big tty_mutex,
which leads to a deadlock because hangup is also called
under the BTM.

This moves the BTM deeper into the tty_hangup function so
we can close the redirected tty without holding the BTM.
In case of pty, we now need to drop the BTM before
calling tty_vhangup.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: John Kacur <jkacur@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years ago8250: fix set_ldisc operation
Arnd Bergmann [Tue, 1 Jun 2010 20:53:11 +0000 (22:53 +0200)]
8250: fix set_ldisc operation

The ldisc number now gets passed into ->set_ldisc.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: release BTM while sleeping in block_til_ready
Arnd Bergmann [Tue, 1 Jun 2010 20:53:10 +0000 (22:53 +0200)]
tty: release BTM while sleeping in block_til_ready

Most tty drivers may block while opening a device.
Since this possibly depends on another thread
closing it first and both threads may need the BTM,
we need to release it here.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: implement BTM as mutex instead of BKL
Arnd Bergmann [Fri, 6 Aug 2010 19:40:30 +0000 (21:40 +0200)]
tty: implement BTM as mutex instead of BKL

The tty locking now follows the rules for mutexes, so
we can replace the BKL usage with a new subsystem
wide mutex.

Using a regular mutex here will change the behaviour
when blocked on the BTM from spinning to sleeping,
but that should not be visible to the user.

Using the mutex also means that all the BTM is now
covered by lockdep.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: remove tty_lock_nested
Arnd Bergmann [Tue, 1 Jun 2010 20:53:08 +0000 (22:53 +0200)]
tty: remove tty_lock_nested

This changes all remaining users of tty_lock_nested
to be non-recursive, which lets us kill this function.
As a consequence, we won't need to keep the lock count
any more, which allows more simplifications later.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: untangle locking of wait_until_sent
Arnd Bergmann [Tue, 1 Jun 2010 20:53:07 +0000 (22:53 +0200)]
tty: untangle locking of wait_until_sent

Some wait_until_sent versions require the big
tty mutex, others don't and some callers of
wait_until_sent already hold it while other don't.
That leads to recursive use of the BTM in these
functions, which we're trying to get rid of.

This turns all cleans up the locking there so
that the driver's wait_until_sent function
never takes the BTM itself if it is already
called with that lock held.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: reorder ldisc locking
Arnd Bergmann [Tue, 1 Jun 2010 20:53:06 +0000 (22:53 +0200)]
tty: reorder ldisc locking

We need to release the BTM in paste_selection() when
sleeping in tty_ldisc_ref_wait to avoid deadlocks
with tty_ldisc_enable.

In tty_set_ldisc, we now always grab the BTM before
taking the ldisc_mutex in order to avoid AB-BA
deadlocks between the two.

tty_ldisc_halt potentially blocks on a workqueue
function that takes the BTM, so we must release
the BTM before calling it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: introduce wait_event_interruptible_tty
Arnd Bergmann [Tue, 1 Jun 2010 20:53:05 +0000 (22:53 +0200)]
tty: introduce wait_event_interruptible_tty

Calling wait_event_interruptible implicitly
releases the BKL when it sleeps, but we need
to do this explcitly when we have converted
it to a mutex.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agocdc-acm: remove dead code
Arnd Bergmann [Tue, 1 Jun 2010 20:53:04 +0000 (22:53 +0200)]
cdc-acm: remove dead code

The wait_event_interruptible_timeout in acm_port_down is
never reached. Remove it to avoid possible deadlocks
with the big tty mutex if someone were to start using
the blocking version of acm_port_down.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: fix console_sem lock order
Arnd Bergmann [Tue, 1 Jun 2010 20:53:03 +0000 (22:53 +0200)]
tty: fix console_sem lock order

vgacon_do_font_op releases and reacquires the BTM while holding
console_sem. This violates the rule that BTM has to be the
outer lock whenever we hold both.

There does not seem to be any reason to give up the BTM here,
so just stop doing that.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: never hold BTM while getting tty_mutex
Arnd Bergmann [Tue, 1 Jun 2010 20:53:02 +0000 (22:53 +0200)]
tty: never hold BTM while getting tty_mutex

tty_mutex is never taken with the BTM held, except for
two corner cases that are worked around here.
We give up the BTM before calling tty_release() in the
error path of tty_open().
Similarly, we reorder the locking in ptmx_open()
to get tty_mutex before the BTM.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: replace BKL with a new tty_lock
Arnd Bergmann [Tue, 1 Jun 2010 20:53:01 +0000 (22:53 +0200)]
tty: replace BKL with a new tty_lock

As a preparation for replacing the big kernel lock
in the TTY layer, wrap all the callers in new
macros tty_lock, tty_lock_nested and tty_unlock.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: fix termios settings in open
Arnd Bergmann [Tue, 29 Jun 2010 20:31:40 +0000 (22:31 +0200)]
serial: fix termios settings in open

Move termios initialization in open into uart_dtr_rts to make sure
it always gets called when necessary. Based on a suggestion from
Alan Cox.

Alan writes:
Ok this sort of makes sense. Something isn't getting initialised and both
getty and minicom will do a termios set which is sorting it out.
This is occurring because the generic block_til_ready sets
ASYNCB_NORMAL_ACTIVE so the termios updating gets skipped.

This patch should cure it and then we can think about doing it more
elegantly by getting the serial layer to use tty_port_open, kfifo and
the like and removing the tons of repeated crap in all the drivers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Tony Luck <tony.luck@intel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: Use block_til_ready helper
Alan Cox [Tue, 1 Jun 2010 20:53:00 +0000 (22:53 +0200)]
serial: Use block_til_ready helper

Our code now rather closely resembles the helper, so switch to it.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: trim locking on the helpers
Alan Cox [Tue, 1 Jun 2010 20:52:59 +0000 (22:52 +0200)]
serial: trim locking on the helpers

The port mutex protects port->tty, but these paths never need to walk from
port->tty. They do need the low level lock as the API expects that but they
already also take it.

Thus we can drop the extra mutex lock calls here.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: add port helpers
Alan Cox [Tue, 1 Jun 2010 20:52:58 +0000 (22:52 +0200)]
serial: add port helpers

We can make this the same as the ones that will be needed by the tty_port
helper logic that we want to move to but still call them from the existing
code base.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: Change the wait for carrier locking
Alan Cox [Tue, 1 Jun 2010 20:52:57 +0000 (22:52 +0200)]
serial: Change the wait for carrier locking

We want to push the lock/unlock into the helper functions so that we
can prepare to move to using the tty_port helper. The expansion initially
comes out a bit ugly but its worth the temporary expansion IMHO just so
we can produce a nice testable series of changes.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: Move the vt_tty field from the vc_data into the standard tty_port
Alan Cox [Tue, 1 Jun 2010 20:52:56 +0000 (22:52 +0200)]
tty: Move the vt_tty field from the vc_data into the standard tty_port

This takes all the tty references through the expected interface points so
we can refcount them.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: Make vt's have a tty_port
Alan Cox [Tue, 1 Jun 2010 20:52:55 +0000 (22:52 +0200)]
tty: Make vt's have a tty_port

The vt layer isn't safely handling reference counts to tty object on the input
side. Add a tty port structure to the vt layer in order to implement this using
the standard helpers.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agovc: Locking clean up
Alan Cox [Tue, 1 Jun 2010 20:52:54 +0000 (22:52 +0200)]
vc: Locking clean up

The virtual console layer uses the BKL for various things that don't really
need it. Clean them out.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: serial - fix tty referencing in set_ldisc
Alan Cox [Tue, 1 Jun 2010 20:52:53 +0000 (22:52 +0200)]
tty: serial - fix tty referencing in set_ldisc

Pass down the ldisc number so that the drivers don't have to peek into the
tty object themselves. This lets us get rid of another case of back referencing
port to tty which we don't want (because of races versus hangup/close).

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: serial - fix tty back references in termios
Alan Cox [Tue, 1 Jun 2010 20:52:52 +0000 (22:52 +0200)]
tty: serial - fix tty back references in termios

One or two drivers go poking back into the tty from the termios setting
routine in unsafe ways. We don't need to pass the tty down because the
[ab]users are just using it to get at things they can get at anyway.

This leaves low_latency setting to sort out along with set_ldisc use.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: serial - fix various misuses/mishandlings of port->tty
Alan Cox [Tue, 1 Jun 2010 20:52:51 +0000 (22:52 +0200)]
tty: serial - fix various misuses/mishandlings of port->tty

Make it robust against hang up events. In most cases we can do this simply
by passing the right things in the first place.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agosynclink: reworking locking a bit
Alan Cox [Tue, 1 Jun 2010 20:52:50 +0000 (22:52 +0200)]
synclink: reworking locking a bit

Use the port mutex and port lock to fix the various races. The locking
still isn't totally consistent but its better than before. Wants switching
to the port helpers.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: Fix the digi acceleport driver NULL checks
Alan Cox [Wed, 19 May 2010 12:01:56 +0000 (13:01 +0100)]
tty: Fix the digi acceleport driver NULL checks

This now refcounts but doesn't actually check the reference was obtained in
all the places it should.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agospecialix: Kill the BKL
Alan Cox [Tue, 1 Jun 2010 20:52:49 +0000 (22:52 +0200)]
specialix: Kill the BKL

Use the port mutex instead

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoepca: Kill the big kernel lock
Alan Cox [Tue, 1 Jun 2010 20:52:48 +0000 (22:52 +0200)]
epca: Kill the big kernel lock

The lock is no longer needed for wait until sent paths so this can go

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agocyclades: Kill off BKL usage
Alan Cox [Tue, 1 Jun 2010 20:52:47 +0000 (22:52 +0200)]
cyclades: Kill off BKL usage

Use the port mutext for config setting, the rest is locked sufficiently
anyway that the BKL makes no odds.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agosynclink: kill the big kernel lock
Alan Cox [Tue, 1 Jun 2010 20:52:46 +0000 (22:52 +0200)]
synclink: kill the big kernel lock

We don't need it while waiting and we can lock the ioctls using the port
mutex. While at it eliminate use of the hangup mutex and switch to the port
mutex.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agorocket: kill BKL
Alan Cox [Tue, 1 Jun 2010 20:52:45 +0000 (22:52 +0200)]
rocket: kill BKL

We can use the port mutex for this and also for the hangup path so removing
the problematic use of the hangup mutex in this driver. Fix up the locking
on the various port flags while we are at it.

Ultimately this driver needs to be using tty_port_ helpers which would sort
this out far better.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoisicom: kill off the BKL
Alan Cox [Tue, 1 Jun 2010 20:52:44 +0000 (22:52 +0200)]
isicom: kill off the BKL

As with the others we can use the port mutex to get the needed locking
properties and fix the race with open.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoriscom8: kill use of lock_kernel
Alan Cox [Tue, 1 Jun 2010 20:52:43 +0000 (22:52 +0200)]
riscom8: kill use of lock_kernel

The riscom8 board uses lock_kernel to protect bits of the port setting
ioctl logic. We can use the port mutex for this as the logic is internal
and will also lock set versus open (a locking property that has been lost
somewhere along the way)

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoistallion: use bit ops for the board flags
Alan Cox [Tue, 1 Jun 2010 20:52:42 +0000 (22:52 +0200)]
istallion: use bit ops for the board flags

This lets us avoid problems with races on the flag changes

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agostallion: prune lock_kernel calls
Alan Cox [Tue, 1 Jun 2010 20:52:41 +0000 (22:52 +0200)]
stallion: prune lock_kernel calls

Remove unneeded tty layer lock kernel bits. Relock the needed bits using the
port mutex. The istallion still has brd state races but those are not new
or introduced by the removal of the lock_kernel logic.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agovt/console: try harder to print output when panicing
Jesse Barnes [Wed, 23 Jun 2010 19:56:12 +0000 (12:56 -0700)]
vt/console: try harder to print output when panicing

Jesse's initial patch commit said:

"At panic time (i.e.  when oops_in_progress is set) we should try a bit
harder to update the screen and make sure output gets to the VT, since
some drivers are capable of flipping back to it.

So make sure we try to unblank and update the display if called from a
panic context."

I've enhanced this to add a flag to the vc that console layer can set to
indicate they want this behaviour to occur.  This also adds support to
fbcon for that flag and adds an fb flag for drivers to indicate they want
to use the support.  It enables this for KMS drivers.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: James Simmons <jsimmons@infradead.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: Add EXTPROC support for LINEMODE
hyc@symas.com [Tue, 22 Jun 2010 17:14:49 +0000 (10:14 -0700)]
tty: Add EXTPROC support for LINEMODE

This patch is against the 2.6.34 source.

Paraphrased from the 1989 BSD patch by David Borman @ cray.com:

     These are the changes needed for the kernel to support
     LINEMODE in the server.

     There is a new bit in the termios local flag word, EXTPROC.
     When this bit is set, several aspects of the terminal driver
     are disabled.  Input line editing, character echo, and mapping
     of signals are all disabled.  This allows the telnetd to turn
     off these functions when in linemode, but still keep track of
     what state the user wants the terminal to be in.

     New ioctl:
         TIOCSIG         Generate a signal to processes in the
                         current process group of the pty.

     There is a new mode for packet driver, the TIOCPKT_IOCTL bit.
     When packet mode is turned on in the pty, and the EXTPROC bit
     is set, then whenever the state of the pty is changed, the
     next read on the master side of the pty will have the TIOCPKT_IOCTL
     bit set.  This allows the process on the server side of the pty
     to know when the state of the terminal has changed; it can then
     issue the appropriate ioctl to retrieve the new state.

Since the original BSD patches accompanied the source code for telnet
I've left that reference here, but obviously the feature is useful for
any remote terminal protocol, including ssh.

The corresponding feature has existed in the BSD tty driver since 1989.
For historical reference, a good copy of the relevant files can be found
here:

http://anonsvn.mit.edu/viewvc/krb5/trunk/src/appl/telnet/?pathrev=17741

Signed-off-by: Howard Chu <hyc@symas.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: remove remaining Hayes ESP ioctls
Greg Kroah-Hartman [Thu, 17 Jun 2010 20:16:08 +0000 (13:16 -0700)]
tty: remove remaining Hayes ESP ioctls

As Jeff Dike pointed out, the Hayes ESP driver was removed in commit
f53a2ade0bb9f2a81f473e6469155172a96b7c38, so these ioctl definitions
should also be removed.  This cleans up the remaining arch-specific
locations of this ioctl value.

Thanks to Arnd for pointing these out.

Cc: Jeff Dike <jdike@addtoit.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agotty: Remove Hayes ESP ioctls
Jeff Dike [Thu, 17 Jun 2010 19:15:16 +0000 (15:15 -0400)]
tty: Remove Hayes ESP ioctls

Remove Hayes ESP ioctls

The Hayes ESP driver has been removed from the tree:
commit f53a2ade0bb9f2a81f473e6469155172a96b7c38
("tty: esp: remove broken driver")
so its ioctls aren't needed any more.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: fix wakup races in the mrst_max3110 driver
Arjan van de Ven [Thu, 17 Jun 2010 10:02:15 +0000 (11:02 +0100)]
serial: fix wakup races in the mrst_max3110 driver

The mrst_max3110 driver had a set of unsafe wakeup sequences
along the following line:

if (!atomic_read(&foo)) {
  atomic_set(&foo, 1);
  wake_up(worker_thread);
}
and the worker thread would do

if (atomic_read(&foo)) {
  do_work();
  atomic_set(&foo, 0);
}

which can result in various missed wakups due to test-then-set races,
as well as due to clear-after-work instead of clear-before-work.

This patch fixes these races by using the proper bit test-and-set operations,
and by doing clear-before-work.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: replace open coded mutex with a real mutex in mrst_max3110.c
Arjan van de Ven [Thu, 17 Jun 2010 10:02:06 +0000 (11:02 +0100)]
serial: replace open coded mutex with a real mutex in mrst_max3110.c

The mrst_max3110.c driver uses an open coded, non atomic variable
to create exclusion between two of its worker threads. More than that,
while the main thread does a proper set-work-clear sequence,
the other thread only does a test, with the result that no actual
exclusion is happening.

this patch replaces this open coded variable with a proper mutex

in addition, the 'lock' spinlock is removed from the per adapter structure,
the lock was only ever initialized but never used

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agomax3110 sanity check a register
jianwei.yang [Wed, 16 Jun 2010 13:46:49 +0000 (14:46 +0100)]
max3110 sanity check a register

MAX3111 is the SPI/UART IC installed on the MRST SPI Port Card as a serial
debug goal, and the SPI Port Card will be frequently mounted and unmounted
from the main board by developers depending whether debug serial is
required or not.

As the MAX3111 has no subvendor or product id registers available, the patch
will try to access one register to decide if this IC is present or not.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agomrst_max3110: add UART driver for Max3110 on Moorestown
Feng Tang [Wed, 16 Jun 2010 13:46:09 +0000 (14:46 +0100)]
mrst_max3110: add UART driver for Max3110 on Moorestown

This driver enable the max3110 device, it can be used as
a system console. the IRQ needs be enabled if user want a
better performance. MRST max3110 works in 3.684MHz clock,
which supports 230400 as its maximum rate.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: add UART_CAP_EFR and UART_CAP_SLEEP flags to 16C950 UARTs definition
Yegor Yefremov [Wed, 16 Jun 2010 14:29:55 +0000 (16:29 +0200)]
serial: add UART_CAP_EFR and UART_CAP_SLEEP flags to 16C950 UARTs definition

Adding UART_CAP_EFR and UART_CAP_SLEEP flags will enable sleep mode
and automatic CTS flow control for 16C950 UARTs. It will also avoid
capabilities detection warning like this:

"ttyS0: detected caps 00000700 should be 00000100"

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agovt: clean up the code - use kernel library
Andy Shevchenko [Tue, 15 Jun 2010 14:24:16 +0000 (17:24 +0300)]
vt: clean up the code - use kernel library

Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoserial: There's no config CONSOLE
Christoph Egger [Wed, 26 May 2010 13:33:43 +0000 (15:33 +0200)]
serial: There's no config CONSOLE

as there's no config CONSOLE (never has been as far as I can tell) and
noone has ever missed that piece of code, it should be safe to remove
it making the kernel a tiny bit less complex.

Signed-off-by: Christoph Egger <siccegge@cs.fau.de>
Acked-by: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agon_gsm.c: removed duplicated #includes
Andrea Gelmini [Sun, 23 May 2010 19:48:24 +0000 (21:48 +0200)]
n_gsm.c: removed duplicated #includes

drivers/char/n_gsm.c: linux/timer.h is included more than once.

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
14 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs...
Linus Torvalds [Tue, 10 Aug 2010 19:14:39 +0000 (12:14 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/ecryptfs/ecryptfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6:
  ecryptfs: dont call lookup_one_len to avoid NULL nameidata
  fs/ecryptfs/file.c: introduce missing free
  ecryptfs: release reference to lower mount if interpose fails
  eCryptfs: Handle ioctl calls with unlocked and compat functions
  ecryptfs: Fix warning in ecryptfs_process_response()

14 years agoMerge branch 'writable_limits' of git://decibel.fi.muni.cz/~xslaby/linux
Linus Torvalds [Tue, 10 Aug 2010 19:07:51 +0000 (12:07 -0700)]
Merge branch 'writable_limits' of git://decibel.fi.muni.cz/~xslaby/linux

* 'writable_limits' of git://decibel.fi.muni.cz/~xslaby/linux:
  unistd: add __NR_prlimit64 syscall numbers
  rlimits: implement prlimit64 syscall
  rlimits: switch more rlimit syscalls to do_prlimit
  rlimits: redo do_setrlimit to more generic do_prlimit
  rlimits: add rlimit64 structure
  rlimits: do security check under task_lock
  rlimits: allow setrlimit to non-current tasks
  rlimits: split sys_setrlimit
  rlimits: selinux, do rlimits changes under task_lock
  rlimits: make sure ->rlim_max never grows in sys_setrlimit
  rlimits: add task_struct to update_rlimit_cpu
  rlimits: security, add task_struct to setrlimit

Fix up various system call number conflicts.  We not only added fanotify
system calls in the meantime, but asm-generic/unistd.h added a wait4
along with a range of reserved per-architecture system calls.

14 years agoMerge git://git.infradead.org/mtd-2.6
Linus Torvalds [Tue, 10 Aug 2010 18:49:21 +0000 (11:49 -0700)]
Merge git://git.infradead.org/mtd-2.6

* git://git.infradead.org/mtd-2.6: (79 commits)
  mtd: Remove obsolete <mtd/compatmac.h> include
  mtd: Update copyright notices
  jffs2: Update copyright notices
  mtd-physmap: add support users can assign the probe type in board files
  mtd: remove redwood map driver
  mxc_nand: Add v3 (i.MX51) Support
  mxc_nand: support 8bit ecc
  mxc_nand: fix correct_data function
  mxc_nand: add V1_V2 namespace to registers
  mxc_nand: factor out a check_int function
  mxc_nand: make some internally used functions overwriteable
  mxc_nand: rework get_dev_status
  mxc_nand: remove 0xe00 offset from registers
  mtd: denali: Add multi connected NAND support
  mtd: denali: Remove set_ecc_config function
  mtd: denali: Remove unuseful code in get_xx_nand_para functions
  mtd: denali: Remove device_info_tag structure
  mtd: m25p80: add support for the Winbond W25Q32 SPI flash chip
  mtd: m25p80: add support for the Intel/Numonyx {16,32,64}0S33B SPI flash chips
  mtd: m25p80: add support for the EON EN25P{32, 64} SPI flash chips
  ...

Fix up trivial conflicts in drivers/mtd/maps/{Kconfig,redwood.c} due to
redwood driver removal.

14 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bcopeland...
Linus Torvalds [Tue, 10 Aug 2010 18:47:36 +0000 (11:47 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/bcopeland/omfs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bcopeland/omfs:
  omfs: fix uninitialized variable warning
  omfs: sanity check cluster size
  omfs: refuse to mount if bitmap pointer is obviously wrong
  omfs: check bounds on block numbers before passing to sb_bread
  omfs: fix memory leak

14 years agoMerge branch 'for-linus' of git://git.infradead.org/users/eparis/notify
Linus Torvalds [Tue, 10 Aug 2010 18:39:13 +0000 (11:39 -0700)]
Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify

* 'for-linus' of git://git.infradead.org/users/eparis/notify: (132 commits)
  fanotify: use both marks when possible
  fsnotify: pass both the vfsmount mark and inode mark
  fsnotify: walk the inode and vfsmount lists simultaneously
  fsnotify: rework ignored mark flushing
  fsnotify: remove global fsnotify groups lists
  fsnotify: remove group->mask
  fsnotify: remove the global masks
  fsnotify: cleanup should_send_event
  fanotify: use the mark in handler functions
  audit: use the mark in handler functions
  dnotify: use the mark in handler functions
  inotify: use the mark in handler functions
  fsnotify: send fsnotify_mark to groups in event handling functions
  fsnotify: Exchange list heads instead of moving elements
  fsnotify: srcu to protect read side of inode and vfsmount locks
  fsnotify: use an explicit flag to indicate fsnotify_destroy_mark has been called
  fsnotify: use _rcu functions for mark list traversal
  fsnotify: place marks on object in order of group memory address
  vfs/fsnotify: fsnotify_close can delay the final work in fput
  fsnotify: store struct file not struct path
  ...

Fix up trivial delete/modify conflict in fs/notify/inotify/inotify.c.

14 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
Linus Torvalds [Tue, 10 Aug 2010 18:26:52 +0000 (11:26 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (96 commits)
  no need for list_for_each_entry_safe()/resetting with superblock list
  Fix sget() race with failing mount
  vfs: don't hold s_umount over close_bdev_exclusive() call
  sysv: do not mark superblock dirty on remount
  sysv: do not mark superblock dirty on mount
  btrfs: remove junk sb_dirt change
  BFS: clean up the superblock usage
  AFFS: wait for sb synchronization when needed
  AFFS: clean up dirty flag usage
  cifs: truncate fallout
  mbcache: fix shrinker function return value
  mbcache: Remove unused features
  add f_flags to struct statfs(64)
  pass a struct path to vfs_statfs
  update VFS documentation for method changes.
  All filesystems that need invalidate_inode_buffers() are doing that explicitly
  convert remaining ->clear_inode() to ->evict_inode()
  Make ->drop_inode() just return whether inode needs to be dropped
  fs/inode.c:clear_inode() is gone
  fs/inode.c:evict() doesn't care about delete vs. non-delete paths now
  ...

Fix up trivial conflicts in fs/nilfs2/super.c

14 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
Linus Torvalds [Tue, 10 Aug 2010 04:05:52 +0000 (21:05 -0700)]
Merge git://git./linux/kernel/git/davem/net-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (59 commits)
  igbvf.txt: Add igbvf Documentation
  igb.txt: Add igb documentation
  e100/e1000*/igb*/ixgb*: Add missing read memory barrier
  ixgbe: fix build error with FCOE_CONFIG without DCB_CONFIG
  netxen: protect tx timeout recovery by rtnl lock
  isdn: gigaset: use after free
  isdn: gigaset: add missing unlock
  solos-pci: Fix race condition in tasklet RX handling
  pkt_sched: Fix sch_sfq vs tcf_bind_filter oops
  net: disable preemption before call smp_processor_id()
  tcp: no md5sig option size check bug
  iwlwifi: fix locking assertions
  iwlwifi: fix TX tracer
  isdn: fix information leak
  net: Fix napi_gro_frags vs netpoll path
  usbnet: remove noisy and hardly useful printk
  rtl8180: avoid potential NULL deref in rtl8180_beacon_work
  ath9k: Remove myself from the MAINTAINERS list
  libertas: scan before assocation if no BSSID was given
  libertas: fix association with some APs by using extended rates
  ...

14 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6
Linus Torvalds [Tue, 10 Aug 2010 04:05:33 +0000 (21:05 -0700)]
Merge git://git./linux/kernel/git/davem/ide-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6:
  tx493xide: use min_t() macro instead of min()
  drivers/ide: Use memdup_user
  via82cxxx: fix typo for VT6415 PCIE PATA IDE Host Controller support.
  ide-cd: Do not access completed requests in the irq handler

14 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
Linus Torvalds [Tue, 10 Aug 2010 04:05:17 +0000 (21:05 -0700)]
Merge git://git./linux/kernel/git/davem/sparc-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc64: Update defconfig.
  sparc: Kill user copy check code.
  sparc64: Fix perf_arch_get_caller_regs().
  sparc64: Add missing ID to parport probing code.

14 years agoMerge branch 'rs485fix' of git://www.jni.nu/cris
Linus Torvalds [Tue, 10 Aug 2010 04:04:23 +0000 (21:04 -0700)]
Merge branch 'rs485fix' of git://www.jni.nu/cris

* 'rs485fix' of git://www.jni.nu/cris:
  CRIS: ioctl for getting RS485 information

14 years agoMerge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
Linus Torvalds [Tue, 10 Aug 2010 04:02:42 +0000 (21:02 -0700)]
Merge branch 'merge' of git://git./linux/kernel/git/benh/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc: fix build with make 3.82
  Revert "Input: appletouch - fix integer overflow issue"
  memblock: Fix memblock_is_region_reserved() to return a boolean
  powerpc: Trim defconfigs
  powerpc: fix i8042 module build error
  sound/soc: mpc5200_psc_ac97: Use gpio pins for cold reset
  powerpc/5200: add mpc5200_psc_ac97_gpio_reset

14 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier...
Linus Torvalds [Tue, 10 Aug 2010 04:01:11 +0000 (21:01 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/vapier/blackfin

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin: (32 commits)
  Blackfin: gpio: add a debounce stub
  Blackfin: update defconfigs
  Blackfin: remove CONFIG_MEM_GENERIC_BOARD
  Blackfin: dpmc: punt unnecessary RTC_ISTAT clearing
  Blackfin: unify rotary encoder bitmasks
  Blackfin: unify SDH/RSI bitmasks
  Blackfin: BF54x: tweak DMAC MMR naming to match other ports
  Blackfin: TWI: clean up the MMR names
  Blackfin: add EVT_OVERRIDE/IPRIO core MMR helpers
  Blackfin: add support for dynamic ftrace
  Blackfin: add support for LZO compressed kernels
  Blackfin: portmux: fix peripheral map overflow when requesting pins
  Blackfin: document SPI CS limitations with CPHA=0
  Blackfin: remove useless and outdated documentation
  Blackfin: BF51x/BF52x: support GPIO Hysteresis/Schmitt Trigger options
  Blackfin: gpio/portmux: clean up whitespace corruption
  Blackfin: make sure mmiowb inserts a write barrier with SSYNC
  Blackfin: fix DMA/cache bug when resuming from suspend to RAM
  Blackfin: BF51x: fix handling of PH8 (the "internal" SPI0SEL4 pin)
  Blackfin: add a GPIO_DEFAULT_BOOT_SPI_CS
  ...

14 years agoMerge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
Linus Torvalds [Tue, 10 Aug 2010 04:00:07 +0000 (21:00 -0700)]
Merge branch 'next' of git://git./linux/kernel/git/djbw/async_tx

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (30 commits)
  DMAENGINE: at_hdmac: locking fixlet
  DMAENGINE: pch_dma: kill another usage of __raw_{read|write}l
  dma: dmatest: fix potential sign bug
  ioat2: catch and recover from broken vtd configurations v6
  DMAENGINE: add runtime slave control to COH 901 318 v3
  DMAENGINE: add runtime slave config to DMA40 v3
  DMAENGINE: generic slave channel control v3
  dmaengine: Driver for Topcliff PCH DMA controller
  intel_mid: Add Mrst & Mfld DMA Drivers
  drivers/dma: Eliminate a NULL pointer dereference
  dma/timb_dma: compile warning on 32 bit
  DMAENGINE: ste_dma40: support older silicon
  DMAENGINE: ste_dma40: support disabling physical channels
  DMAENGINE: ste_dma40: no disabled phy channels on ux500
  DMAENGINE: ste_dma40: fix suspend bug
  DMAENGINE: ste_dma40: add DB8500 memcpy channels
  DMAENGINE: ste_dma40: no flow control on memcpy
  DMAENGINE: ste_dma40: arch updates for LCLA and LCPA
  DMAENGINE: ste_dma40: allocate LCLA dynamically
  DMAENGINE: ste_dma40: no premature stop
  ...

Fix up trivial conflicts in arch/arm/mach-ux500/devices-db8500.c

14 years agodrivers/char/vt.c:vc_do_resize(): local var `end' should be unsigned long
qiaochong [Tue, 10 Aug 2010 00:21:27 +0000 (17:21 -0700)]
drivers/char/vt.c:vc_do_resize(): local var `end' should be unsigned long

According include/linux/console_struct.h,vc_scr_end is unsigned long.

struct vc_data {
    unsigned short  vc_num;         /* Console number */
    unsigned int    vc_cols;        /* [#] Console size */
    unsigned int    vc_rows;
    unsigned int    vc_size_row;        /* Bytes per row */
    unsigned int    vc_scan_lines;      /* # of scan lines */
    unsigned long   vc_origin;      /* [!] Start of real screen */
    unsigned long   vc_scr_end;     /* [!] End of real screen */
    unsigned long   vc_visible_origin;  /* [!] Top of visible window */
    unsigned int    vc_top, vc_bottom;  /* Scrolling region */
    const struct consw *vc_sw;
    unsigned short  *vc_screenbuf;
...
}

Signed-off-by: qiaochong <qiaochong@loongson.cn>
Cc: Greg KH <greg@kroah.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agodrivers/char/vt.c: fix vc->vc_origin on take_over_console()
qiaochong [Tue, 10 Aug 2010 00:21:23 +0000 (17:21 -0700)]
drivers/char/vt.c: fix vc->vc_origin on take_over_console()

kernel will die on some platform when switch from vga mode to framebuffer
mode.  The reason of this bug is that bind_con_driver reset vc->vc_origin
to (unsigned long)vc->vc_screenbuf.

On vgacon vc->vc_origin is not releated to vc->vc_screenbuf,if set
vc->vc_origin to vc->vc_screenbuf,kernel will die on vc_do_resize.

static int vc_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
        struct vc_data *vc, unsigned int cols, unsigned int lines)
{
    unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
    unsigned int old_cols, old_rows, old_row_size, old_screen_size;
    unsigned int new_cols, new_rows, new_row_size, new_screen_size;
    unsigned int end, user;
...
        end = (old_rows > new_rows) ? old_origin +
            (old_row_size * new_rows) :
            vc->vc_scr_end;

...
/*
here for a test from vgacon to framebuffer:
old_origin=0x810814a0,end=0xb00b8fa0,vc->vc_origin=0x810814a0
the code bellow will copy memory from 0x810814a0 to 0xb00b8fa0,
this will cover kernel code,kernel died here.
*/

    while (old_origin < end) {

        scr_memcpyw((unsigned short *) new_origin,
                (unsigned short *) old_origin, rlth);
        if (rrem)
            scr_memsetw((void *)(new_origin + rlth),
                    vc->vc_video_erase_char, rrem);
        old_origin += old_row_size;
        new_origin += new_row_size;
    }

...
}

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: qiaochong <qiaochong@loongson.cn>
Cc: Greg KH <greg@kroah.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agorwsem: smaller wrappers around rwsem_down_failed_common
Michel Lespinasse [Tue, 10 Aug 2010 00:21:20 +0000 (17:21 -0700)]
rwsem: smaller wrappers around rwsem_down_failed_common

More code can be pushed from rwsem_down_read_failed and
rwsem_down_write_failed into rwsem_down_failed_common.

Following change adding down_read_critical infrastructure support also
enjoys having flags available in a register rather than having to fish it
out in the struct rwsem_waiter...

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Mike Waychison <mikew@google.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Ying Han <yinghan@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agorwsem: wake queued readers when writer blocks on active read lock
Michel Lespinasse [Tue, 10 Aug 2010 00:21:19 +0000 (17:21 -0700)]
rwsem: wake queued readers when writer blocks on active read lock

This change addresses the following situation:

- Thread A acquires the rwsem for read
- Thread B tries to acquire the rwsem for write, notices there is already
  an active owner for the rwsem.
- Thread C tries to acquire the rwsem for read, notices that thread B already
  tried to acquire it.
- Thread C grabs the spinlock and queues itself on the wait queue.
- Thread B grabs the spinlock and queues itself behind C. At this point A is
  the only remaining active owner on the rwsem.

In this situation thread B could notice that it was the last active writer
on the rwsem, and decide to wake C to let it proceed in parallel with A
since they both only want the rwsem for read.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Mike Waychison <mikew@google.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Ying Han <yinghan@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agorwsem: let RWSEM_WAITING_BIAS represent any number of waiting threads
Michel Lespinasse [Tue, 10 Aug 2010 00:21:18 +0000 (17:21 -0700)]
rwsem: let RWSEM_WAITING_BIAS represent any number of waiting threads

Previously each waiting thread added a bias of RWSEM_WAITING_BIAS.  With
this change, the bias is added only once to indicate that the wait list is
non-empty.

This has a few nice properties which will be used in following changes:
- when the spinlock is held and the waiter list is known to be non-empty,
  count < RWSEM_WAITING_BIAS  <=>  there is an active writer on that sem
- count == RWSEM_WAITING_BIAS  <=>  there are waiting threads and no
                                     active readers/writers on that sem

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Mike Waychison <mikew@google.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Ying Han <yinghan@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agorwsem: lighter active count checks when waking up readers
Michel Lespinasse [Tue, 10 Aug 2010 00:21:17 +0000 (17:21 -0700)]
rwsem: lighter active count checks when waking up readers

In __rwsem_do_wake(), we can skip the active count check unless we come
there from up_xxxx().  Also when checking the active count, it is not
actually necessary to increment it; this allows us to get rid of the read
side undo code and simplify the calculation of the final rwsem count
adjustment once we've counted the reader threads to wake.

The basic observation is the following.  When there are waiter threads on
a rwsem and the spinlock is held, other threads can only increment the
active count by trying to grab the rwsem in down_xxxx().  However
down_xxxx() will notice there are waiter threads and take the down_failed
path, blocking to acquire the spinlock on the way there.  Therefore, a
thread observing an active count of zero with waiters queued and the
spinlock held, is protected against other threads acquiring the rwsem
until it wakes the last waiter or releases the spinlock.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Mike Waychison <mikew@google.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Ying Han <yinghan@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agorwsem: fully separate code paths to wake writers vs readers
Michel Lespinasse [Tue, 10 Aug 2010 00:21:15 +0000 (17:21 -0700)]
rwsem: fully separate code paths to wake writers vs readers

This is in preparation for later changes in the series.

In __rwsem_do_wake(), the first queued waiter is checked first in order to
determine whether it's a writer or a reader.  The code paths diverge at
this point.  The code that checks and increments the rwsem active count is
duplicated on both sides - the point is that later changes in the series
will be able to independently modify both sides.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Mike Waychison <mikew@google.com>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Ying Han <yinghan@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agohwmon: f71882fg: add support for the Fintek F71808E
Giel van Schijndel [Tue, 10 Aug 2010 00:21:13 +0000 (17:21 -0700)]
hwmon: f71882fg: add support for the Fintek F71808E

Allow device probing to recognise the Fintek F71808E.

Sysfs interface:
 * Fan/pwm control is the same as for F71889FG
 * Temperature and voltage sensor handling is largely the same as for
   the F71889FG
  - Has one temperature sensor less (doesn't have temp3)
  - Misses one voltage sensor (doesn't have V6, thus in6_input refers to
    what in7_input refers for F71889FG)

For the purpose of the sysfs interface fxxxx_in_temp_attr[] is split up
such that it can largely be reused.

Signed-off-by: Giel van Schijndel <me@mortis.eu>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agodrivers/hwmon/coretemp.c: remove unneeded #ifdef CONFIG_HOTPLUG_CPU
Andrew Morton [Tue, 10 Aug 2010 00:21:11 +0000 (17:21 -0700)]
drivers/hwmon/coretemp.c: remove unneeded #ifdef CONFIG_HOTPLUG_CPU

register_hotcpu_notifier() is designed to make these ifdefs unnecessary.

Cc: Chen Gong <gong.chen@linux.intel.com>
Cc: Rudolf Marek <r.marek@assembler.cz>
Cc: Huaxu Wan <huaxu.wan@intel.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agohwmon: coretemp: documentation update and cleanup
Chen Gong [Tue, 10 Aug 2010 00:21:10 +0000 (17:21 -0700)]
hwmon: coretemp: documentation update and cleanup

Update coretemp supported CPU TjMax lists and some cleanup work.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Cc: Rudolf Marek <r.marek@assembler.cz>
Cc: Huaxu Wan <huaxu.wan@intel.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agohwmon: coretemp: enable coretemp device add operation failure
Chen Gong [Tue, 10 Aug 2010 00:21:10 +0000 (17:21 -0700)]
hwmon: coretemp: enable coretemp device add operation failure

If one coretemp device can't be added, it should allow subsequent adding
operation because every new-added device will create a new sysfs group,
not an additional sensor sys entry.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Cc: Rudolf Marek <r.marek@assembler.cz>
Cc: Huaxu Wan <huaxu.wan@intel.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agohwmon: coretemp: update hotplug condition check
Chen Gong [Tue, 10 Aug 2010 00:21:09 +0000 (17:21 -0700)]
hwmon: coretemp: update hotplug condition check

Fix two errors in hotplug.  One is for hotplug notifier.  The other is
unnecessary driver unregister.  Because even none of online cpus supports
coretemp, we can't assume new onlined cpu doesn't support it either.  If
related driver is unregistered there we have no chance to use coretemp
from then on.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Cc: Rudolf Marek <r.marek@assembler.cz>
Cc: Huaxu Wan <huaxu.wan@intel.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agohwmon: add support for JEDEC JC 42.4 compliant temperature sensors
Guenter Roeck [Tue, 10 Aug 2010 00:21:08 +0000 (17:21 -0700)]
hwmon: add support for JEDEC JC 42.4 compliant temperature sensors

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
14 years agohwmon: driver for SMM665 Six-Channel Active DC Output Controller/Monitor
Guenter Roeck [Tue, 10 Aug 2010 00:21:06 +0000 (17:21 -0700)]
hwmon: driver for SMM665 Six-Channel Active DC Output Controller/Monitor

This driver adds support for the monitoring features of the Summit
Microelectronics SMM665 Six-Channel Active DC Output Controller/Monitor.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>