media: v4l2-mem2mem: prevent pollerr when last_buffer_dequeued is set

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[ Upstream commit d4de27a9b1 ]

If the last buffer was dequeued from the capture queue,
signal userspace. DQBUF(CAPTURE) will return -EPIPE.

But if output queue is empty and capture queue is empty,
v4l2_m2m_poll_for_data will return EPOLLERR,
This is very easy to happen in drain.

When last_buffer_dequeued is set, we shouldn't return EPOLLERR,
but return EPOLLIN | EPOLLRDNORM.

Fixes: 1698a7f151 ("media: v4l2-mem2mem: simplify poll logic")
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Ming Qian 2022-06-15 04:19:20 +01:00 • committed by Greg Kroah-Hartman

parent d27fed11f4

commit fc43574e06

1 changed files with 1 additions and 1 deletions

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drivers/media/v4l2-core/v4l2-mem2mem.c

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