tree 6a97a2e92a3068782cca7d139456e695c82935ec
parent aeb2ecd6096182cc080d37679080c0f088dcd4a4
author Tejun Heo <htejun@gmail.com> 1150105555 +0900
committer Jeff Garzik <jeff@garzik.org> 1150119441 -0400

[PATCH] sata_sil: update device hotplug handling, take #2

SIEN on some 3112 controllers doesn't mask SATA IRQ properly.  IRQ
stays asserted even after SIEN is masked and IRQ is acked.  Also, even
while frozen, any SATA PHY event including hardreset raises SATA IRQ.
Clearing SError seems to be the only way to deassert SATA IRQ.

This patch makes sil_host_intr() clear SError on SATA IRQs and ignore
SATA IRQs reported while frozen so that hardreset doesn't trigger
hotplug event (which ends up hardresetting again).

In such cases, the port still gets re-frozen to minimize the danger of
screaming interrupts.  This results in one nil EH repeat on
controllers with broken SIEN but other than that does no harm.

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