media: v4l2-dev: lock req_queue_mutex

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We need to serialize streamon/off with queueing new requests.
These ioctls may trigger the cancellation of a streaming
operation, and that should not be mixed with queuing a new
request at the same time.

Finally close() needs this lock since that too can trigger the
cancellation of a streaming operation.

We take the req_queue_mutex here before any other locks since
it is a very high-level lock.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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Hans Verkuil 2018-05-21 04:54:34 -04:00 • committed by Mauro Carvalho Chehab

parent 93a9d9008d

commit cc6eddcd37

2 changed files with 37 additions and 3 deletions

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18

drivers/media/v4l2-core/v4l2-dev.c

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22

drivers/media/v4l2-core/v4l2-ioctl.c

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