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V4L/DVB (6601): V4L: videobuf-core locking fixes and comments

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- Add comments to functions that require that caller hold q->lock
- Add __videobuf_mmap_free that doesn't hold q->lock for use within videobuf
- Add locking to videobuf_mmap_free
- Fix linux/drivers/media/common/saa7146_video.c which was holding lock around
  videobuf_read_stop
- Add locking to functions that operate on a queue
- Add videobuf_stop to take care of stopping in both the read and stream case

TODO: bttv still has an unsafe call to videobuf_queue_is_busy

Signed-off-by: Brandon Philips <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Brandon Philips 2007-11-13 20:05:38 -03:00 • committed by Mauro Carvalho Chehab
commit 19bc5133da
3 changed files with 161 additions and 93 deletions
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2
include/media/videobuf-core.h
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@ -208,6 +208,8 @@ int videobuf_cgmbuf(struct videobuf_queue *q,
int videobuf_streamon(struct videobuf_queue *q);
int videobuf_streamoff(struct videobuf_queue *q);
void videobuf_stop(struct videobuf_queue *q);
int videobuf_read_start(struct videobuf_queue *q);
void videobuf_read_stop(struct videobuf_queue *q);
ssize_t videobuf_read_stream(struct videobuf_queue *q,