From: Tejun Heo <tj@kernel.org>
Date: Sat, 5 Jul 2008 04:10:50 +0000 (+0900)
Subject: ahci: give another shot at clearing all bits in irq_stat
X-Git-Tag: v2.6.26-rc9~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d28f87aa87ce8b196349d7c306a7e6fe3abd7155;p=pandora-kernel.git

ahci: give another shot at clearing all bits in irq_stat

Commit ea0c62f7cf70f13a67830471b613337bd0c9a62e tried to clear all
bits in irq_stat but it didn't actually achieve that as irq_stat was
anded with port_map right after read.  This patch makes ahci driver
always use the unmasked value to clear irq_status.

While at it, add explanation on the peculiarities of ahci IRQ
clearing.

This was spotted by Linus Torvalds.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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