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author | Hans Verkuil <hverkuil@xs4all.nl> | 2010-09-26 08:47:38 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-10-21 01:06:14 -0200 |
commit | ee6869afc922a9849979e49bb3bbcad794872fcb (patch) | |
tree | 2266050d01da694d04b533a6509873888327108b /init | |
parent | c29fcff3daafbf46d64a543c1950bbd206ad8c1c (diff) |
V4L/DVB: v4l2: add core serialization lock
Drivers can optionally set a pointer to a mutex in struct video_device.
The core will use that to lock before calling open, read, write, unlocked_ioctl,
poll, mmap or release.
Updated the documentation as well and ensure that v4l2-event knows about the
lock: it will unlock it before doing a blocking wait on an event and relock it
afterwards.
Ensure that the 'video_is_registered' check is done when the lock is held:
a typical disconnect will take the lock as well before unregistering the
device nodes, so to prevent race conditions the video_is_registered check
should also be done with the lock held.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions