diff options
| author | Hans Verkuil <hverkuil-cisco@xs4all.nl> | 2020-12-01 13:44:43 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2021-01-04 13:14:25 +0100 |
| commit | 28955a61568ca4ef39ef7fc814b443be24616c64 (patch) | |
| tree | 50e213599c76d44e8d87c338d13d07a23e02461a /drivers/media/v4l2-core/v4l2-dev.c | |
| parent | 726daf6bafe9d1d9e5c36e1e2a4008941fbc28bd (diff) | |
media: v4l2-dev/event: add v4l2_event_wake_all()
When unregistering a V4L2 device node, make sure any filehandles
that are waiting for an event are woken up.
Add v4l2_event_wake_all() to v4l2-event.c and call it from
video_unregister_device().
Otherwise userspace might never know that a device node was removed.
[hverkuil: checkpatch: replaced 'if (vdev == NULL)' by 'if (!vdev)']
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-dev.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-dev.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c index a593ea0598b5..0ddc3554f1a4 100644 --- a/drivers/media/v4l2-core/v4l2-dev.c +++ b/drivers/media/v4l2-core/v4l2-dev.c @@ -28,6 +28,7 @@ #include <media/v4l2-common.h> #include <media/v4l2-device.h> #include <media/v4l2-ioctl.h> +#include <media/v4l2-event.h> #define VIDEO_NUM_DEVICES 256 #define VIDEO_NAME "video4linux" @@ -1086,6 +1087,8 @@ void video_unregister_device(struct video_device *vdev) */ clear_bit(V4L2_FL_REGISTERED, &vdev->flags); mutex_unlock(&videodev_lock); + if (test_bit(V4L2_FL_USES_V4L2_FH, &vdev->flags)) + v4l2_event_wake_all(vdev); device_unregister(&vdev->dev); } EXPORT_SYMBOL(video_unregister_device); |