Revert "bus: mhi: Add inbound buffers allocation flag"

This reverts commit 0092a1e3f7636ff4e202a41b0320690699247e22

This should be reverted in the char-misc-next branch to make merging
with Linus's branch possible due to issues with the mhi code that was
found in the networking tree.

Link: https://lore.kernel.org/r/20210827175852.GB15018@thinkpad
Reported-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bhaumik Bhatt <bbhatt@codeaurora.org>
Cc: Hemant Kumar <hemantk@codeaurora.org>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: Loic Poulain <loic.poulain@linaro.org>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
index 721739c..3a732af 100644 (file)
--- a/drivers/bus/mhi/core/internal.h
+++ b/drivers/bus/mhi/core/internal.h
@@ -682,7 +682,7 @@ void mhi_rddm_prepare(struct mhi_controller *mhi_cntrl,
                      struct image_info *img_info);
 void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl);
 int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
-                       struct mhi_chan *mhi_chan, unsigned int flags);
+                       struct mhi_chan *mhi_chan);
 int mhi_init_chan_ctxt(struct mhi_controller *mhi_cntrl,
                       struct mhi_chan *mhi_chan);
 void mhi_deinit_chan_ctxt(struct mhi_controller *mhi_cntrl,

diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
index c01ec2f..b15c5bc 100644 (file)
--- a/drivers/bus/mhi/core/main.c
+++ b/drivers/bus/mhi/core/main.c
@@ -1430,7 +1430,7 @@ exit_unprepare_channel:
 }
 
 int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
-                       struct mhi_chan *mhi_chan, unsigned int flags)
+                       struct mhi_chan *mhi_chan)
 {
        int ret = 0;
        struct device *dev = &mhi_chan->mhi_dev->dev;
@@ -1455,9 +1455,6 @@ int mhi_prepare_channel(struct mhi_controller *mhi_cntrl,
        if (ret)
                goto error_pm_state;
 
-       if (mhi_chan->dir == DMA_FROM_DEVICE)
-               mhi_chan->pre_alloc = !!(flags & MHI_CH_INBOUND_ALLOC_BUFS);
-
        /* Pre-allocate buffer for xfer ring */
        if (mhi_chan->pre_alloc) {
                int nr_el = get_nr_avail_ring_elements(mhi_cntrl,
@@ -1613,7 +1610,7 @@ void mhi_reset_chan(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan)
 }
 
 /* Move channel to start state */
-int mhi_prepare_for_transfer(struct mhi_device *mhi_dev, unsigned int flags)
+int mhi_prepare_for_transfer(struct mhi_device *mhi_dev)
 {
        int ret, dir;
        struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
@@ -1624,7 +1621,7 @@ int mhi_prepare_for_transfer(struct mhi_device *mhi_dev, unsigned int flags)
                if (!mhi_chan)
                        continue;
 
-               ret = mhi_prepare_channel(mhi_cntrl, mhi_chan, flags);
+               ret = mhi_prepare_channel(mhi_cntrl, mhi_chan);
                if (ret)
                        goto error_open_chan;
        }

diff --git a/drivers/net/mhi/net.c b/drivers/net/mhi/net.c
index 11be6bc..e60e38c 100644 (file)
--- a/drivers/net/mhi/net.c
+++ b/drivers/net/mhi/net.c
@@ -335,7 +335,7 @@ static int mhi_net_newlink(void *ctxt, struct net_device *ndev, u32 if_id,
        u64_stats_init(&mhi_netdev->stats.tx_syncp);
 
        /* Start MHI channels */
-       err = mhi_prepare_for_transfer(mhi_dev, 0);
+       err = mhi_prepare_for_transfer(mhi_dev);
        if (err)
                goto out_err;
 

diff --git a/drivers/net/wwan/mhi_wwan_ctrl.c b/drivers/net/wwan/mhi_wwan_ctrl.c
index d0a98f3..e4d0f69 100644 (file)
--- a/drivers/net/wwan/mhi_wwan_ctrl.c
+++ b/drivers/net/wwan/mhi_wwan_ctrl.c
@@ -110,7 +110,7 @@ static int mhi_wwan_ctrl_start(struct wwan_port *port)
        int ret;
 
        /* Start mhi device's channel(s) */
-       ret = mhi_prepare_for_transfer(mhiwwan->mhi_dev, 0);
+       ret = mhi_prepare_for_transfer(mhiwwan->mhi_dev);
        if (ret)
                return ret;
 

diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index b8ca694..9c347f5 100644 (file)
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -721,13 +721,8 @@ void mhi_device_put(struct mhi_device *mhi_dev);
  *                            host and device execution environments match and
  *                            channels are in a DISABLED state.
  * @mhi_dev: Device associated with the channels
- * @flags: MHI channel flags
  */
-int mhi_prepare_for_transfer(struct mhi_device *mhi_dev,
-                            unsigned int flags);
-
-/* Automatically allocate and queue inbound buffers */
-#define MHI_CH_INBOUND_ALLOC_BUFS BIT(0)
+int mhi_prepare_for_transfer(struct mhi_device *mhi_dev);
 
 /**
  * mhi_unprepare_from_transfer - Reset UL and DL channels for data transfer.

diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
index c609cb7..c269c53 100644 (file)
--- a/net/qrtr/mhi.c
+++ b/net/qrtr/mhi.c
@@ -84,7 +84,7 @@ static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev,
        int rc;
 
        /* start channels */
-       rc = mhi_prepare_for_transfer(mhi_dev, MHI_CH_INBOUND_ALLOC_BUFS);
+       rc = mhi_prepare_for_transfer(mhi_dev);
        if (rc)
                return rc;