From: Philipp Zabel <p.zabel@pengutronix.de>
Date: Mon, 4 May 2015 10:51:06 +0000 (-0300)
Subject: [media] videobuf2: return -EPIPE from DQBUF after the last buffer
X-Git-Tag: omap-for-v4.3/legacy-v2-signed~140^2~388
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c16218402a000bb25c1277c43ae98c11bcb59bd1;p=pandora-kernel.git

[media] videobuf2: return -EPIPE from DQBUF after the last buffer

If the last buffer was dequeued from a capture queue, let poll return
immediately and let DQBUF return -EPIPE to signal there will no more
buffers to dequeue until STREAMOFF.
The driver signals the last buffer by setting the V4L2_BUF_FLAG_LAST.
To reenable dequeuing on the capture queue, the driver must explicitly
call vb2_clear_last_buffer_queued. The last buffer queued flag is
cleared automatically during STREAMOFF.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
---

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