libata-link: update ata_scsi_error() to handle PMP links

Update ata_scsi_error() to handle PMP links.  As error conditions can
occur on both host and PMP links, __ata_port_for_each_link() is used.

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

drivers/ata/libata-eh.c

@@ -363,6 +363,8 @@ void ata_scsi_error(struct Scsi_Host *host)
  repeat:
 	/* invoke error handler */
 	if (ap->ops->error_handler) {
+		struct ata_link *link;
+
 		/* kill fast drain timer */
 		del_timer_sync(&ap->fastdrain_timer);
 
@@ -372,9 +374,11 @@ void ata_scsi_error(struct Scsi_Host *host)
 		/* fetch & clear EH info */
 		spin_lock_irqsave(ap->lock, flags);
 
-		memset(&ap->link.eh_context, 0, sizeof(ap->link.eh_context));
-		ap->link.eh_context.i = ap->link.eh_info;
-		memset(&ap->link.eh_info, 0, sizeof(ap->link.eh_info));
+		__ata_port_for_each_link(link, ap) {
+			memset(&link->eh_context, 0, sizeof(link->eh_context));
+			link->eh_context.i = link->eh_info;
+			memset(&link->eh_info, 0, sizeof(link->eh_info));
+		}
 
 		ap->pflags |= ATA_PFLAG_EH_IN_PROGRESS;
 		ap->pflags &= ~ATA_PFLAG_EH_PENDING;
@@ -410,7 +414,8 @@ void ata_scsi_error(struct Scsi_Host *host)
 		}
 
 		/* this run is complete, make sure EH info is clear */
-		memset(&ap->link.eh_info, 0, sizeof(ap->link.eh_info));
+		__ata_port_for_each_link(link, ap)
+			memset(&link->eh_info, 0, sizeof(link->eh_info));
 
 		/* Clear host_eh_scheduled while holding ap->lock such
 		 * that if exception occurs after this point but