From: Florian Fainelli <f.fainelli@gmail.com>
Date: Thu, 15 May 2014 02:32:13 +0000 (-0700)
Subject: net: systemport: only update UMAC_CMD if something changed
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~36^2~217
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5e32cc7c997d1d4f18031f5ff88512bd65118f7;p=pandora-kernel.git

net: systemport: only update UMAC_CMD if something changed

The link adjustment callback can be called as frequently as desired by
the PHY library, as such, let's avoid doing a Read/Modify/Write sequence
if nothing changed, which is more than likely since we are interfaced
with a switch device.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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