libata-eh: call freeze hook before port abort

Tejun,

This patch looks like it might work for !PMP setups, but I am not so sure about PMP.

Any comments? This should help begin addressing the problem where hardware needs the DMA engine turned off before accessing the taskfile registers -- something needed for ata_port_abort() via ata_qc_complete().

Jeff

index 0183131..0b7ed40 100644
@@ -1013,8 +1013,8 @@ int ata_port_freeze(struct ata_port *ap)
 
 	WARN_ON(!ap->ops->error_handler);
 
-	nr_aborted = ata_port_abort(ap);
 	__ata_port_freeze(ap);
+	nr_aborted = ata_port_abort(ap);
 
 	return nr_aborted;
 }

Hello,

Looks good to me too. PMP shouldn't make any difference if the port is being frozen. The new behavior is more correct.

Yeah, if this can work around the reported problem, I think this is the correct way to fix it.

Thanks.

tejun