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libata-sff: fix HSM_ST_ERR handling in __ata_sff_port_intr() 

While separating out BMDMA irq handler from SFF, commit c3b28894
(libata-sff: separate out BMDMA irq handler) incorrectly made
__ata_sff_port_intr() consider an IRQ to be an idle one if the host
state was transitioned to HSM_ST_ERR by ata_bmdma_port_intr().

This makes BMDMA drivers ignore IRQs reporting host bus error which
leads to timeouts instead of triggering EH immediately.  Fix it by
making __ata_sff_port_intr() consider the IRQ to be an idle one iff
the state is HSM_ST_IDLE.  This is equivalent to adding HSM_ST_ERR to
the "break"ing case but less error-prone.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Antonio Toma <antonio.toma@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2010-12-03 15:19:13 +01:00 committed by Jeff Garzik
parent 90a8a73c06
commit 687a993339
1 changed files with 3 additions and 4 deletions
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7
drivers/ata/libata-sff.c
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@ -1532,11 +1532,10 @@ static unsigned int __ata_sff_port_intr(struct ata_port *ap,
if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
return ata_sff_idle_irq(ap);
break;
case HSM_ST:
case HSM_ST_LAST:
break;
default:
case HSM_ST_IDLE:
return ata_sff_idle_irq(ap);
default:
break;
}
/* check main status, clearing INTRQ if needed */