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authorSylwester Nawrocki <s.nawrocki@samsung.com>2013-05-31 11:37:25 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-06-12 22:01:53 -0300
commit26d63d13da2c7de2547f6f455ae20045285dfeb8 (patch)
tree99d4e314b909af97a335f9419a5b2a51dbdd4f0f /drivers/media
parent52917bcbe06c937e97d941ef21211f981f192f99 (diff)
[media] exynos4-is: Add locking at fimc(-lite) subdev unregistered handler
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>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/platform/exynos4-is/fimc-capture.c4
-rw-r--r--drivers/media/platform/exynos4-is/fimc-lite.c4
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/media/platform/exynos4-is/fimc-capture.c b/drivers/media/platform/exynos4-is/fimc-capture.c
index 33c6a2f0ad74..1578aa4e4bb5 100644
--- a/drivers/media/platform/exynos4-is/fimc-capture.c
+++ b/drivers/media/platform/exynos4-is/fimc-capture.c
@@ -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 = {
diff --git a/drivers/media/platform/exynos4-is/fimc-lite.c b/drivers/media/platform/exynos4-is/fimc-lite.c
index 24e2a0f8797a..3f76f8abc4b3 100644
--- a/drivers/media/platform/exynos4-is/fimc-lite.c
+++ b/drivers/media/platform/exynos4-is/fimc-lite.c
@@ -1300,11 +1300,15 @@ static void fimc_lite_subdev_unregistered(struct v4l2_subdev *sd)
if (fimc == NULL)
return;
+ mutex_lock(&fimc->lock);
+
if (video_is_registered(&fimc->ve.vdev)) {
video_unregister_device(&fimc->ve.vdev);
media_entity_cleanup(&fimc->ve.vdev.entity);
fimc->ve.pipe = NULL;
}
+
+ mutex_unlock(&fimc->lock);
}
static const struct v4l2_subdev_internal_ops fimc_lite_subdev_internal_ops = {