sata_mv: disregard masked irqs
Part four of simplifying/fixing handling of the main_irq_mask register to resolve unexpected interrupt issues observed in 2.6.26-rc*. Ignore masked IRQs in mv_interrupt(). This prevents "unexpected device interrupt while idle" messages. Signed-off-by: NMark Lord <mlord@pobox.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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