3 files changed, 21 insertions, 3 deletions

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 042153c..e1a395b 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -162,6 +162,10 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 	unsigned int xfer = 0;
 	unsigned int si;
 
+	/* If the device fell off, no sense in issuing commands */
+	if (dev->gone)
+		return AC_ERR_SYSTEM;
+
 	task = sas_alloc_task(GFP_ATOMIC);
 	if (!task)
 		return AC_ERR_SYSTEM;
@@ -347,6 +351,7 @@ static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
 static struct ata_port_operations sas_sata_ops = {
 	.phy_reset		= sas_ata_phy_reset,
 	.post_internal_cmd	= sas_ata_post_internal,
+	.qc_defer               = ata_std_qc_defer,
 	.qc_prep		= ata_noop_qc_prep,
 	.qc_issue		= sas_ata_qc_issue,
 	.qc_fill_rtf		= sas_ata_qc_fill_rtf,
diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 83dd507..505ffe3 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -175,10 +175,10 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 	switch (resp->result) {
 	case SMP_RESP_PHY_VACANT:
 		phy->phy_state = PHY_VACANT;
-		return;
+		break;
 	default:
 		phy->phy_state = PHY_NOT_PRESENT;
-		return;
+		break;
 	case SMP_RESP_FUNC_ACC:
 		phy->phy_state = PHY_EMPTY; /* do not know yet */
 		break;
@@ -209,7 +209,10 @@ static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 	phy->phy->negotiated_linkrate = phy->linkrate;
 
 	if (!rediscover)
-		sas_phy_add(phy->phy);
+		if (sas_phy_add(phy->phy)) {
+			sas_phy_free(phy->phy);
+			return;
+		}
 
 	SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 		    SAS_ADDR(dev->sas_addr), phy->phy_id,
@@ -1724,6 +1727,7 @@ static void sas_unregister_ex_tree(struct domain_device *dev)
 	struct domain_device *child, *n;
 
 	list_for_each_entry_safe(child, n, &ex->children, siblings) {
+		child->gone = 1;
 		if (child->dev_type == EDGE_DEV ||
 		    child->dev_type == FANOUT_DEV)
 			sas_unregister_ex_tree(child);
@@ -1744,6 +1748,7 @@ static void sas_unregister_devs_sas_addr(struct domain_device *parent,
 			&ex_dev->children, siblings) {
 			if (SAS_ADDR(child->sas_addr) ==
 			    SAS_ADDR(phy->attached_sas_addr)) {
+				child->gone = 1;
 				if (child->dev_type == EDGE_DEV ||
 				    child->dev_type == FANOUT_DEV)
 					sas_unregister_ex_tree(child);
@@ -1752,6 +1757,7 @@ static void sas_unregister_devs_sas_addr(struct domain_device *parent,
 				break;
 			}
 		}
+		parent->gone = 1;
 		sas_disable_routing(parent, phy->attached_sas_addr);
 	}
 	memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 535085c..55f09e9 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -217,6 +217,13 @@ int sas_queuecommand(struct scsi_cmnd *cmd,
 			goto out;
 		}
 
+		/* If the device fell off, no sense in issuing commands */
+		if (dev->gone) {
+			cmd->result = DID_BAD_TARGET << 16;
+			scsi_done(cmd);
+			goto out;
+		}
+
 		res = -ENOMEM;
 		task = sas_create_task(cmd, dev, GFP_ATOMIC);
 		if (!task)