sata_mv: fix pmp drives not found
Part three of simplifying/fixing handling of the main_irq_mask register to resolve unexpected interrupt issues observed in 2.6.26-rc*. Partially fix a reported bug whereby we sometimes miss seeing drives on a port-multiplier, as reported by Gwendal Grignou <gwendal@google.com>. The problem was that we were receiving unexpected interrupts during EH from POLLed commands while accessing port-multiplier registers. These unexpected interrupts can be prevented by masking the DONE_IRQ bit for the port whenever not operating in EDMA mode. Also fix port_stop() to mask all port interrupts. Signed-off-by: NMark Lord <mlord@pobox.com> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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