From: Hans Verkuil <hans.verkuil@cisco.com>
Date: Tue, 18 Nov 2014 12:51:08 +0000 (-0300)
Subject: [media] vb2: use dma_map_sg_attrs to prevent unnecessary sync
X-Git-Tag: omap-for-v3.19/fixes-rc1~133^2~84
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=251a79f8f5adfd816de4e052b5e3619a5a1d0910;p=pandora-kernel.git

[media] vb2: use dma_map_sg_attrs to prevent unnecessary sync

By default dma_map_sg syncs the mapped buffer to the device. But
buf_prepare expects a buffer syncs for the cpu and the buffer
will be synced to the device in the prepare memop.

The reverse is true for dma_unmap_sg, buf_finish and the finish
memop.

To prevent unnecessary syncs we ask dma_(un)map_sg to skip the
sync.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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