media: videobuf2-v4l2.c: add vb2_video_unregister_device helper function

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If a driver calls (_)vb2_fop_release(), then such a driver should also
call vb2_video_unregister_device() instead of video_unregister_device().
This helper will call vb2_queue_release() if a filehandle is marked as
owner of the queue. This ensures that at unregister time any streaming
is cancelled and all buffers are returned to userspace.

This is very useful for complex drivers since this stops all streaming
in all subdevs in the pipeline controlled by this video device. Otherwise
this would be delayed until the owner filehandle is closed, which can be
quite some time later.

Bonus points for ordering the includes :-)

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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Hans Verkuil 2020-07-13 13:30:42 +02:00 • committed by Mauro Carvalho Chehab

parent 0832e07eee

commit f729ef5796

2 changed files with 62 additions and 6 deletions

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55

drivers/media/common/videobuf2/videobuf2-v4l2.c

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17

include/media/videobuf2-v4l2.h

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