Brandon Philips
137d1cb19d
V4L/DVB (7493): videobuf: Avoid deadlock with QBUF and bring up to spec for empty queue ...
Add a waitqueue to wait on when there are no buffers in the buffer queue.
DQBUF waits on this queue without holding vb_lock to allow a QBUF to happen.
Once a buffer has been queued we recheck that the queue is still streaming and
wait on the new buffer's waitqueue while holding the vb_lock. The driver
should come along in a timely manner and put the buffer into its next state
finishing the DQBUF.
By implementing this waitqueue it also brings the videobuf DQBUF up to spec and
it now blocks on O_NONBLOCK even when no buffers have been queued via QBUF:
"By default VIDIOC_DQBUF blocks when no buffer is in the outgoing queue."
- V4L2 spec
Signed-off-by: Brandon Philips <bphilips@suse.de>
CC: Trent Piepho <xyzzy@speakeasy.org>
CC: Carl Karsten <carl@personnelware.com>
CC: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24 14:07:57 -03:00
asm-generic: add node_to_cpumask_ptr macro
2008-04-19 19:44:58 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc
2008-04-21 17:23:30 -07:00
avr32: add include/asm-avr32/serial.h
2008-04-19 20:40:10 -04:00
include: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:16:54 -04:00
frv: remove HARD_RESET_NOW()
2008-04-21 16:03:13 -07:00
asm-generic: add node_to_cpumask_ptr macro
2008-04-19 19:44:58 +02:00
[IA64] move XP and XPC to drivers/misc/sgi-xp
2008-04-22 15:08:17 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
2008-04-18 08:39:24 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
2008-04-18 08:39:24 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6
2008-04-18 08:39:24 -07:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
2008-04-21 15:50:49 -07:00
include: Remove unnecessary inclusions of asm/semaphore.h
2008-04-18 22:16:54 -04:00
Merge branch 'semaphore' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc
2008-04-18 08:25:29 -07:00
i2c: Renesas SH7760 I2C master driver
2008-04-22 22:16:47 +02:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
2008-04-21 17:20:53 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
2008-04-21 17:20:53 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel
2008-04-21 15:40:24 -07:00
[CRYPTO] aes: Export generic setkey
2008-04-21 10:19:34 +08:00
KEYS: Fix the comment to match the file name in rxrpc-type.h.
2008-04-21 22:43:55 +00:00
V4L/DVB (7453): v4l2-api: Define a standard control for color killer functionality
2008-04-24 14:07:56 -03:00
V4L/DVB (7493): videobuf: Avoid deadlock with QBUF and bring up to spec for empty queue
2008-04-24 14:07:57 -03:00
[IPSEC]: Fix catch-22 with algorithm IDs above 31
2008-04-22 00:46:42 -07:00
IB: convert struct class_device to struct device
2008-04-19 19:10:30 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6
2008-04-21 15:49:58 -07:00
137d1cb19d