From: Ben Hutchings <ben.hutchings@codethink.co.uk>
Date: Tue, 3 Mar 2015 00:52:00 +0000 (+0000)
Subject: sh_eth: Ensure proper ordering of descriptor active bit write/read
X-Git-Tag: omap-for-v4.1/wl12xx-dt~68^2~5^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d7355f58ba4f9d68d2fb79864bab4ccb618e4e1;p=pandora-kernel.git

sh_eth: Ensure proper ordering of descriptor active bit write/read

When submitting a DMA descriptor, the active bit must be written last.
When reading a completed DMA descriptor, the active bit must be read
first.

Add memory barriers to ensure that this ordering is maintained.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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