diff mbox series

[v2,1/8] v4l2-mem2mem: return CAPTURE buffer first

Message ID 20200318132108.21873-2-ezequiel@collabora.com
State Superseded
Headers show
Series [v2,1/8] v4l2-mem2mem: return CAPTURE buffer first | expand

Commit Message

Ezequiel Garcia March 18, 2020, 1:21 p.m. UTC 
When the request API is used, typically an OUTPUT (src) buffer
will be part of a request. A userspace process will be typically
blocked, waiting on the request file descriptor.

Returning the OUTPUT (src) buffer will wake-up such processes,
who will immediately attempt to dequeue the CAPTURE buffer,
only to find it's still unavailable.

Therefore, change v4l2_m2m_buf_done_and_job_finish returning
the CAPTURE (dst) buffer first, to avoid signalling the request
file descriptor prematurely, i.e. before the CAPTURE buffer is done.

When the request API is not used, this change should have
no impact.

Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
---
 drivers/media/v4l2-core/v4l2-mem2mem.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 8986c31176e9..62ac9424c92a 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -504,12 +504,21 @@  void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
 
 	if (WARN_ON(!src_buf || !dst_buf))
 		goto unlock;
-	v4l2_m2m_buf_done(src_buf, state);
 	dst_buf->is_held = src_buf->flags & V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
 	if (!dst_buf->is_held) {
 		v4l2_m2m_dst_buf_remove(m2m_ctx);
 		v4l2_m2m_buf_done(dst_buf, state);
 	}
+	/*
+	 * If the request API is being used, returning the OUTPUT
+	 * (src) buffer will wake-up any process waiting on the
+	 * request file descriptor.
+	 *
+	 * Therefore, return the CAPTURE (dst) buffer first,
+	 * to avoid signalling the request file descriptor
+	 * before the CAPTURE buffer is done.
+	 */
+	v4l2_m2m_buf_done(src_buf, state);
 	schedule_next = _v4l2_m2m_job_finish(m2m_dev, m2m_ctx);
 unlock:
 	spin_unlock_irqrestore(&m2m_dev->job_spinlock, flags);