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authorHans Verkuil <hverkuil-cisco@xs4all.nl>2020-12-01 15:44:43 +0300
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2021-01-04 15:14:25 +0300
commit28955a61568ca4ef39ef7fc814b443be24616c64 (patch)
tree50e213599c76d44e8d87c338d13d07a23e02461a /include/media
parent726daf6bafe9d1d9e5c36e1e2a4008941fbc28bd (diff)
downloadlinux-28955a61568ca4ef39ef7fc814b443be24616c64.tar.xz
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 'include/media')
-rw-r--r--include/media/v4l2-event.h13
1 files changed, 11 insertions, 2 deletions
diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h
index 3f0281d06ec7..4ffa914ade3a 100644
--- a/include/media/v4l2-event.h
+++ b/include/media/v4l2-event.h
@@ -101,7 +101,7 @@ int v4l2_event_dequeue(struct v4l2_fh *fh, struct v4l2_event *event,
*
* .. note::
* The driver's only responsibility is to fill in the type and the data
- * fields.The other fields will be filled in by V4L2.
+ * fields. The other fields will be filled in by V4L2.
*/
void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
@@ -116,11 +116,20 @@ void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
*
* .. note::
* The driver's only responsibility is to fill in the type and the data
- * fields.The other fields will be filled in by V4L2.
+ * fields. The other fields will be filled in by V4L2.
*/
void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
/**
+ * v4l2_event_wake_all - Wake all filehandles.
+ *
+ * Used when unregistering a video device.
+ *
+ * @vdev: pointer to &struct video_device
+ */
+void v4l2_event_wake_all(struct video_device *vdev);
+
+/**
* v4l2_event_pending - Check if an event is available
*
* @fh: pointer to &struct v4l2_fh