From: Tejun Heo <htejun@gmail.com>
Date: Fri, 7 Dec 2007 23:45:27 +0000 (+0900)
Subject: sata_sil: fix spurious IRQ handling
X-Git-Tag: v2.6.24-rc6~23^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8cf32ac6578a70025be1103466da9d1d6141429e;p=pandora-kernel.git

sata_sil: fix spurious IRQ handling

Interestingly, sata_sil raises spurious interrupts if it's coupled
with Sil SATA_PATA bridge.  Currently, sata_sil interrupt handler is
strict about spurious interrupts and freezes the port when it occurs.
This patch makes it more forgiving.

* On SATA PHY event interrupt, serror value is checked to see whether
  it really is PHYRDY CHG event.  If not, SATA PHY event interrupt is
  ignored.

* If ATA interrupt occurs while no command is in progress, it's
  cleared and ignored.

This fixes bugzilla bug 9505.

  http://bugzilla.kernel.org/show_bug.cgi?id=9505

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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