From: Javier Martin <javier.martin@vista-silicon.com>
Date: Tue, 7 Feb 2012 10:14:42 +0000 (-0300)
Subject: [media] media i.MX27 camera: improve discard buffer handling
X-Git-Tag: v3.4-rc1~110^2^2~134
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cdc9d6f191d81aa1b1b34db9d3a33f779f5c5ec7;p=pandora-kernel.git

[media] media i.MX27 camera: improve discard buffer handling

The way discard buffer was previously handled lead
to possible races that made a buffer that was not
yet ready to be overwritten by new video data. This
is easily detected at 25fps just adding "#define DEBUG"
to enable the "memset" check and seeing how the image
is corrupted.

A new "discard" queue and two discard buffers have
been added to make them flow trough the pipeline
of queues and thus provide suitable event ordering.

Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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