[SCSI] libsas: fix SATA NCQ error

Current version of libsas can not handle SATA NCQ error.
This patch handle SATA NCQ error as AHCI do.
Signed-off-by: NXiangliang Yu <yuxiangl@marvell.com>
Signed-off-by: NJames Bottomley <jbottomley@parallels.com>

drivers/scsi/libsas/sas_ata.c

@@ -99,19 +99,29 @@ static void sas_ata_task_done(struct sas_task *task)
 	struct sas_ha_struct *sas_ha;
 	enum ata_completion_errors ac;
 	unsigned long flags;
+	struct ata_link *link;
 
 	if (!qc)
 		goto qc_already_gone;
 
 	dev = qc->ap->private_data;
 	sas_ha = dev->port->ha;
+	link = &dev->sata_dev.ap->link;
 
 	spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 	if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
 	    ((stat->stat == SAM_STAT_CHECK_CONDITION &&
 	      dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
 		ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
-		qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
+
+		if (!link->sactive) {
+			qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
+		} else {
+			link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command);
+			if (unlikely(link->eh_info.err_mask))
+				qc->flags |= ATA_QCFLAG_FAILED;
+		}
+
 		dev->sata_dev.sstatus = resp->sstatus;
 		dev->sata_dev.serror = resp->serror;
 		dev->sata_dev.scontrol = resp->scontrol;
@@ -121,7 +131,13 @@ static void sas_ata_task_done(struct sas_task *task)
 			SAS_DPRINTK("%s: SAS error %x\n", __func__,
 				    stat->stat);
 			/* We saw a SAS error. Send a vague error. */
-			qc->err_mask = ac;
+			if (!link->sactive) {
+				qc->err_mask = ac;
+			} else {
+				link->eh_info.err_mask |= AC_ERR_DEV;
+				qc->flags |= ATA_QCFLAG_FAILED;
+			}
+
 			dev->sata_dev.tf.feature = 0x04; /* status err */
 			dev->sata_dev.tf.command = ATA_ERR;
 		}