[libata] Improve timeout handling

On a timeout call a device specific handler early in the recovery so that
we can complete and process successful commands which timed out due to IRQ
loss or the like rather more elegantly.

[Revised to exclude the timeout handling on a few devices that inherit from
 SFF but are not SFF enough to use the default timeout handler]

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 8a75105..a377226 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -646,6 +646,8 @@
 static struct ata_port_operations mv5_ops = {
 	.inherits		= &ata_sff_port_ops,
 
+	.lost_interrupt		= ATA_OP_NULL,
+
 	.qc_defer		= mv_qc_defer,
 	.qc_prep		= mv_qc_prep,
 	.qc_issue		= mv_qc_issue,