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[media] exynos4-is: Add locking at fimc(-lite) subdev unregistered handler

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Protect the fimc/fimc-lite video nodes unregistration with their video
lock. This prevents a kernel crash when e.g. udev opens a video node
right after the driver registers it and then the driver tries to
unregister it and defers its probing. Using video_is_unregistered()
together with the video mutex allows safe unregistration of the video
nodes at any time.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki
2013-05-31 11:37:25 -03:00
committed by Mauro Carvalho Chehab
parent 52917bcbe0
commit 26d63d13da
2 changed files with 8 additions and 0 deletions
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4
drivers/media/platform/exynos4-is/fimc-capture.c
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@@ -1855,6 +1855,8 @@ static void fimc_capture_subdev_unregistered(struct v4l2_subdev *sd)
if (fimc == NULL)
return;
mutex_lock(&fimc->lock);
fimc_unregister_m2m_device(fimc);
vdev = &fimc->vid_cap.ve.vdev;
@@ -1866,6 +1868,8 @@ static void fimc_capture_subdev_unregistered(struct v4l2_subdev *sd)
}
kfree(fimc->vid_cap.ctx);
fimc->vid_cap.ctx = NULL;
mutex_unlock(&fimc->lock);
}
static const struct v4l2_subdev_internal_ops fimc_capture_sd_internal_ops = {