From: Mark Lord <liml@rtr.ca>
Date: Sat, 17 May 2008 17:38:00 +0000 (-0400)
Subject: sata_mv: cache main_irq_mask register in hpriv
X-Git-Tag: v2.6.26-rc4~120^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96e2c487933e5f69e98fffdcae2c35c78a671c07;p=pandora-kernel.git

sata_mv: cache main_irq_mask register in hpriv

Part five of simplifying/fixing handling of the main_irq_mask register
to resolve unexpected interrupt issues observed in 2.6.26-rc*.

Keep a cached copy of the main_irq_mask so that we don't have
to stall the CPU to read it on every pass through mv_interrupt.

This significantly speeds up interrupt handling, both for sata_mv,
and for any other driver/device sharing the same PCI IRQ line.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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