From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Thu, 11 Mar 2010 03:30:50 +0000 (+0800)
Subject: MIPS: Lemote 2F: Ensure atomic execution of _rdmsr and _wrmsr
X-Git-Tag: v2.6.34-rc4~6^2~26
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b846c10da5d6a5c159ab4dea92c1080d5add9fb1;p=pandora-kernel.git

MIPS: Lemote 2F: Ensure atomic execution of _rdmsr and _wrmsr

On Lemote 2F CS5536 MSRs are accessed through a index / data register pair.
The access sequence must be protected by a spinlock to be atomic.

Without this rebooting in fs2f_reboot() may fail.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: David Daney <ddaney@caviumnetworks.com>
Patchwork: http://patchwork.linux-mips.org/patch/1058/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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