From: Len Brown <len.brown@intel.com>
Date: Wed, 28 Jan 2009 17:47:15 +0000 (-0500)
Subject: ACPI: remove locking from PM1x_STS register reads
X-Git-Tag: v2.6.29-rc4~7^2^3~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a2b7b01c072435b7832ab392167545a1b38cabc3;p=pandora-kernel.git

ACPI: remove locking from PM1x_STS register reads

PM1a_STS and PM1b_STS are twins that get OR'd together
on reads, and all writes are repeated to both.

The fields in PM1x_STS are single bits only,
there are no multi-bit fields.

So it is not necessary to lock PM1x_STS reads against
writes because it is impossible to read an intermediate
value of a single bit.  It will either be 0 or 1,
even if a write is in progress during the read.
Reads are asynchronous to writes no matter if a lock
is used or not.

Signed-off-by: Len Brown <len.brown@intel.com>
---

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