lkml.org 
[lkml]   [2020]   [Aug]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 1/2] media: v4l2-mem2mem: always consider OUTPUT queue during poll
Date
If poll() is called on a m2m device with the EPOLLOUT event after the
last buffer of the CAPTURE queue is dequeued, any buffer available on
OUTPUT queue will never be signaled because v4l2_m2m_poll_for_data()
starts by checking whether dst_q->last_buffer_dequeued is set and
returns EPOLLIN in this case, without looking at the state of the OUTPUT
queue.

Fix this by not early returning so we keep checking the state of the
OUTPUT queue afterwards.

Signed-off-by: Alexandre Courbot <gnurou@gmail.com>
---
drivers/media/v4l2-core/v4l2-mem2mem.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 95a8f2dc5341d..fe90c3c0e4128 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -868,10 +868,8 @@ static __poll_t v4l2_m2m_poll_for_data(struct file *file,
* If the last buffer was dequeued from the capture queue,
* return immediately. DQBUF will return -EPIPE.
*/
- if (dst_q->last_buffer_dequeued) {
- spin_unlock_irqrestore(&dst_q->done_lock, flags);
- return EPOLLIN | EPOLLRDNORM;
- }
+ if (dst_q->last_buffer_dequeued)
+ rc |= EPOLLIN | EPOLLRDNORM;
}
spin_unlock_irqrestore(&dst_q->done_lock, flags);

--
2.28.0
\
 
 \ /
  Last update: 2020-08-27 14:52    [W:0.046 / U:0.660 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site