Patch "[media] pxa_camera: fix module remove codepath for v4l2 clock" has been added to the 4.9-stable tree

Patch "[media] pxa_camera: fix module remove codepath for v4l2 clock" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    [media] pxa_camera: fix module remove codepath for v4l2 clock

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pxa_camera-fix-module-remove-codepath-for-v4l2-clock.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 17:09:24 CEST 2018
From: Petr Cvek <petr.cvek@tul.cz>
Date: Mon, 24 Apr 2017 22:51:58 -0300
Subject: [media] pxa_camera: fix module remove codepath for v4l2 clock

From: Petr Cvek <petr.cvek@tul.cz>


[ Upstream commit e3b4d10cc057522353c4a02f2f90dca6a52e006f ]

The conversion from soc_camera omitted a correct handling of the clock
gating for a sensor. When the pxa_camera driver module was removed it
tried to unregister clk, but this caused a similar warning:

  WARNING: CPU: 0 PID: 6740 at drivers/media/v4l2-core/v4l2-clk.c:278
  v4l2_clk_unregister(): Refusing to unregister ref-counted 0-0030 clock!

The clock was at time still refcounted by the sensor driver. Before
the removing of the pxa_camera the clock must be dropped by the sensor
driver. This should be triggered by v4l2_async_notifier_unregister() call
which removes sensor driver module too, calls unbind() function and then
tries to probe sensor driver again. Inside unbind() we can safely
unregister the v4l2 clock as the sensor driver got removed. The original
v4l2_clk_unregister() should be put inside test as the clock can be
already unregistered from unbind(). If there was not any bound sensor
the clock is still present.

The codepath is practically a copy from the old soc_camera. The bug was
tested with a pxa_camera+ov9640 combination during the conversion
of the ov9640 from the soc_camera.

Signed-off-by: Petr Cvek <petr.cvek@tul.cz>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/media/platform/pxa_camera.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/media/platform/pxa_camera.c
+++ b/drivers/media/platform/pxa_camera.c
@@ -2169,6 +2169,12 @@ static void pxa_camera_sensor_unbind(str
 	pxa_dma_stop_channels(pcdev);
 
 	pxa_camera_destroy_formats(pcdev);
+
+	if (pcdev->mclk_clk) {
+		v4l2_clk_unregister(pcdev->mclk_clk);
+		pcdev->mclk_clk = NULL;
+	}
+
 	video_unregister_device(&pcdev->vdev);
 	pcdev->sensor = NULL;
 
@@ -2495,7 +2501,13 @@ static int pxa_camera_remove(struct plat
 	dma_release_channel(pcdev->dma_chans[1]);
 	dma_release_channel(pcdev->dma_chans[2]);
 
-	v4l2_clk_unregister(pcdev->mclk_clk);
+	v4l2_async_notifier_unregister(&pcdev->notifier);
+
+	if (pcdev->mclk_clk) {
+		v4l2_clk_unregister(pcdev->mclk_clk);
+		pcdev->mclk_clk = NULL;
+	}
+
 	v4l2_device_unregister(&pcdev->v4l2_dev);
 
 	dev_info(&pdev->dev, "PXA Camera driver unloaded\n");


Patches currently in stable-queue which might be from petr.cvek@tul.cz are

queue-4.9/pxa_camera-fix-module-remove-codepath-for-v4l2-clock.patch