[media] videobuf2-core: add helper functions
Add helper functions to make it easier to adapt drivers to vb2. These helpers take care of core locking and check if the filehandle is the owner of the queue. Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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