From: Jean Delvare <khali@linux-fr.org>
Date: Mon, 30 Mar 2009 19:46:40 +0000 (+0200)
Subject: hwmon: (ds1621) Avoid unneeded register access
X-Git-Tag: v2.6.30-rc1~606^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e4879e28abd67b894fb9d2db0afd08f1945670ba;p=pandora-kernel.git

hwmon: (ds1621) Avoid unneeded register access

Register access over SMBus isn't cheap, so avoid register access where
possible:
* Only write back the configuration register if it changed.
* Don't refresh the register cache when we don't have to.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Aurelien Jarno <aurelien@aurel32.net>
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