From 7d7355f58ba4f9d68d2fb79864bab4ccb618e4e1 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben.hutchings@codethink.co.uk>
Date: Tue, 3 Mar 2015 00:52:00 +0000
Subject: [PATCH] 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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