From: Tejun Heo <htejun@gmail.com>
Date: Wed, 29 Nov 2006 02:33:14 +0000 (+0900)
Subject: [PATCH] ahci: ignore PORT_IRQ_IF_ERR on JMB controllers
X-Git-Tag: v2.6.20-rc1~34^2~40^2~468^2^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41669553353554211310cdb23079d58af1fda41e;p=pandora-kernel.git

[PATCH] ahci: ignore PORT_IRQ_IF_ERR on JMB controllers

JMicron AHCI controllers set PORT_IRQ_IF_ERR on device errors.  The
IRQ status bit indicates interface error or protocol mismatch and ahci
driver interprets it into AC_ERR_ATA_BUS.  So, whenever an ATAPI
device raises check condition, ahci interprets it as ATA bus error and
thus resets it which, in turn, raises check condition thus creating a
reset loop and rendering the device unuseable.

This patch makes JMB controllers ignore PORT_IRQ_IF_ERR when
interpreting error condition.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Justin Tsai <justin@jmicron.com>
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