scsi: ibmvfc: Fix invalid state machine BUG_ON()

This fixes an issue hitting the BUG_ON() in ibmvfc_do_work(). When going
through a host action of IBMVFC_HOST_ACTION_RESET, we change the action to
IBMVFC_HOST_ACTION_TGT_DEL, then drop the host lock, and reset the CRQ,
which changes the host state to IBMVFC_NO_CRQ. If, prior to setting the
host state to IBMVFC_NO_CRQ, ibmvfc_init_host() is called, it can then end
up changing the host action to IBMVFC_HOST_ACTION_INIT.  If we then change
the host state to IBMVFC_NO_CRQ, we will then hit the BUG_ON().

Make a couple of changes to avoid this. Leave the host action to be
IBMVFC_HOST_ACTION_RESET or IBMVFC_HOST_ACTION_REENABLE until after we drop
the host lock and reset or reenable the CRQ. Also harden the host state
machine to ensure we cannot leave the reset / reenable state until we've
finished processing the reset or reenable.

Link: https://lore.kernel.org/r/20210413001009.902400-1-tyreld@linux.ibm.com
Fixes: 73ee5d86 ("[SCSI] ibmvfc: Fix soft lockup on resume")
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
[tyreld: added fixes tag]
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
[mkp: fix comment checkpatch warnings]
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi/ibmvfc.c

@@ -604,8 +604,17 @@ static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 		if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 			vhost->action = action;
 		break;
+	case IBMVFC_HOST_ACTION_REENABLE:
+	case IBMVFC_HOST_ACTION_RESET:
+		vhost->action = action;
+		break;
 	case IBMVFC_HOST_ACTION_INIT:
 	case IBMVFC_HOST_ACTION_TGT_DEL:
+	case IBMVFC_HOST_ACTION_LOGO:
+	case IBMVFC_HOST_ACTION_QUERY_TGTS:
+	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
+	case IBMVFC_HOST_ACTION_NONE:
+	default:
 		switch (vhost->action) {
 		case IBMVFC_HOST_ACTION_RESET:
 		case IBMVFC_HOST_ACTION_REENABLE:
@@ -615,15 +624,6 @@ static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 			break;
 		}
 		break;
-	case IBMVFC_HOST_ACTION_LOGO:
-	case IBMVFC_HOST_ACTION_QUERY_TGTS:
-	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
-	case IBMVFC_HOST_ACTION_NONE:
-	case IBMVFC_HOST_ACTION_RESET:
-	case IBMVFC_HOST_ACTION_REENABLE:
-	default:
-		vhost->action = action;
-		break;
 	}
 }
 
@@ -5380,30 +5380,49 @@ static void ibmvfc_do_work(struct ibmvfc_host *vhost)
 	case IBMVFC_HOST_ACTION_INIT_WAIT:
 		break;
 	case IBMVFC_HOST_ACTION_RESET:
-		vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
 		list_splice_init(&vhost->purge, &purge);
 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
 		ibmvfc_complete_purge(&purge);
 		rc = ibmvfc_reset_crq(vhost);
+
 		spin_lock_irqsave(vhost->host->host_lock, flags);
-		if (rc == H_CLOSED)
+		if (!rc || rc == H_CLOSED)
 			vio_enable_interrupts(to_vio_dev(vhost->dev));
-		if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
-		    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
-			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
-			dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
+		if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
+			/*
+			 * The only action we could have changed to would have
+			 * been reenable, in which case, we skip the rest of
+			 * this path and wait until we've done the re-enable
+			 * before sending the crq init.
+			 */
+			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
+
+			if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
+			    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
+				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+				dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
+			}
 		}
 		break;
 	case IBMVFC_HOST_ACTION_REENABLE:
-		vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
 		list_splice_init(&vhost->purge, &purge);
 		spin_unlock_irqrestore(vhost->host->host_lock, flags);
 		ibmvfc_complete_purge(&purge);
 		rc = ibmvfc_reenable_crq_queue(vhost);
+
 		spin_lock_irqsave(vhost->host->host_lock, flags);
-		if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
-			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
-			dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
+		if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
+			/*
+			 * The only action we could have changed to would have
+			 * been reset, in which case, we skip the rest of this
+			 * path and wait until we've done the reset before
+			 * sending the crq init.
+			 */
+			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
+			if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
+				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
+				dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
+			}
 		}
 		break;
 	case IBMVFC_HOST_ACTION_LOGO: