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[RESEND,2/2] media: v4l2-mem2mem: return for polling if a buffer is available

Message ID 1369108050-13522-3-git-send-email-sw0312.kim@samsung.com (mailing list archive)
State Awaiting Upstream
Delegated to: Kamil Debski
Headers

Commit Message

Seung-Woo Kim May 21, 2013, 3:47 a.m. UTC 
  The v4l2_m2m_poll() does not need to wait if there is already a buffer in
done_list of source and destination queues, but current v4l2_m2m_poll() always
waits. So done_list of each queue is checked before calling poll_wait().

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> 
---
 drivers/media/v4l2-core/v4l2-mem2mem.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 66f599f..9ac39b5 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -486,8 +486,10 @@  unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
 	if (m2m_ctx->m2m_dev->m2m_ops->unlock)
 		m2m_ctx->m2m_dev->m2m_ops->unlock(m2m_ctx->priv);
 
-	poll_wait(file, &src_q->done_wq, wait);
-	poll_wait(file, &dst_q->done_wq, wait);
+	if (list_empty(&src_q->done_list))
+		poll_wait(file, &src_q->done_wq, wait);
+	if (list_empty(&dst_q->done_list))
+		poll_wait(file, &dst_q->done_wq, wait);
 
 	if (m2m_ctx->m2m_dev->m2m_ops->lock)
 		m2m_ctx->m2m_dev->m2m_ops->lock(m2m_ctx->priv);