[PATCH] [127/139] libata-sff: fix HSM_ST_ERR handling in __ata_sff_port_intr()

[Andi Kleen]

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Tejun Heo <tj@xxxxxxxxxx>

commit 687a993339c4f3a63654746230da3aab8bbdbffd upstream.

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@xxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Reported-by: Antonio Toma <antonio.toma@xxxxxxxxx>
Signed-off-by: Jeff Garzik <jgarzik@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/ata/libata-sff.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Index: linux-2.6.35.y/drivers/ata/libata-sff.c
===================================================================
--- linux-2.6.35.y.orig/drivers/ata/libata-sff.c
+++ linux-2.6.35.y/drivers/ata/libata-sff.c
@@ -1515,11 +1515,10 @@ static unsigned int __ata_sff_port_intr(
 		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 */
--
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