vb2: fix a regression in poll() behavior for output,streams

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commit 4623e59674 upstream.

In the 3.17 kernel the poll() behavior changed for output streams:
as long as not all buffers were queued up poll() would return that
userspace can write. This is fine for the write() call, but when
using stream I/O this changed the behavior since the expectation
was that it would wait for buffers to become available for dequeuing.

This patch only enables the check whether you can queue buffers
for file I/O only, and skips it for stream I/O.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Hans Verkuil 2015-10-29 03:02:06 -02:00 • committed by Greg Kroah-Hartman

parent f51c5d31c8

commit 368e554ba6

1 changed files with 3 additions and 3 deletions

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drivers/media/v4l2-core/videobuf2-v4l2.c

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