From: Brandon Philips <brandon@ifup.org>
Date: Tue, 13 Nov 2007 23:05:38 +0000 (-0300)
Subject: V4L/DVB (6601): V4L: videobuf-core locking fixes and comments
X-Git-Tag: v2.6.24-rc6~96
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19bc5133dae9562e8824ef101464061f9854c1d8;p=pandora-kernel.git

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

- 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 <bphilips@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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