tree 339d460b43d2ec7206c9d147d2ad6f8fcbfa3870
parent ee6869afc922a9849979e49bb3bbcad794872fcb
author Hans Verkuil <hverkuil@xs4all.nl> 1285014270 -0300
committer Mauro Carvalho Chehab <mchehab@redhat.com> 1287630374 -0200

V4L/DVB: videobuf: prepare to make locking optional in videobuf

Currently videobuf uses the vb_lock mutex to lock its data structures.
But this locking will (optionally) move into the v4l2 core, which means
that in that case vb_lock shouldn't be used since the external lock is already
held.

Prepare for this by adding a pointer to such an external mutex and
don't lock if that pointer is set.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>