scsi: lpfc: Release hbalock before calling lpfc_worker_wake_up()

lpfc_worker_wake_up() calls the lpfc_work_done() routine, which takes the
hbalock.  Thus, lpfc_worker_wake_up() should not be called while holding the
hbalock to avoid potential deadlock.

Signed-off-by: Justin Tee <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Justin Tee

drivers/scsi/lpfc/lpfc_els.c

@@ -4437,23 +4437,23 @@ lpfc_els_retry_delay(struct timer_list *t)
 	unsigned long flags;
 	struct lpfc_work_evt  *evtp = &ndlp->els_retry_evt;
 
+	/* Hold a node reference for outstanding queued work */
+	if (!lpfc_nlp_get(ndlp))
+		return;
+
 	spin_lock_irqsave(&phba->hbalock, flags);
 	if (!list_empty(&evtp->evt_listp)) {
 		spin_unlock_irqrestore(&phba->hbalock, flags);
+		lpfc_nlp_put(ndlp);
 		return;
 	}
 
-	/* We need to hold the node by incrementing the reference
-	 * count until the queued work is done
-	 */
-	evtp->evt_arg1  = lpfc_nlp_get(ndlp);
-	if (evtp->evt_arg1) {
-		evtp->evt = LPFC_EVT_ELS_RETRY;
-		list_add_tail(&evtp->evt_listp, &phba->work_list);
-		lpfc_worker_wake_up(phba);
-	}
+	evtp->evt_arg1 = ndlp;
+	evtp->evt = LPFC_EVT_ELS_RETRY;
+	list_add_tail(&evtp->evt_listp, &phba->work_list);
 	spin_unlock_irqrestore(&phba->hbalock, flags);
-	return;
+
+	lpfc_worker_wake_up(phba);
 }
 
 /**

drivers/scsi/lpfc/lpfc_hbadisc.c

@@ -257,7 +257,9 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport)
 		if (evtp->evt_arg1) {
 			evtp->evt = LPFC_EVT_DEV_LOSS;
 			list_add_tail(&evtp->evt_listp, &phba->work_list);
+			spin_unlock_irqrestore(&phba->hbalock, iflags);
 			lpfc_worker_wake_up(phba);
+			return;
 		}
 		spin_unlock_irqrestore(&phba->hbalock, iflags);
 	} else {
@@ -275,10 +277,7 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport)
 			lpfc_disc_state_machine(vport, ndlp, NULL,
 						NLP_EVT_DEVICE_RM);
 		}
-
 	}
-
-	return;
 }
 
 /**

drivers/scsi/lpfc/lpfc_sli.c

@@ -1217,9 +1217,9 @@ lpfc_set_rrq_active(struct lpfc_hba *phba, struct lpfc_nodelist *ndlp,
 	empty = list_empty(&phba->active_rrq_list);
 	list_add_tail(&rrq->list, &phba->active_rrq_list);
 	phba->hba_flag |= HBA_RRQ_ACTIVE;
+	spin_unlock_irqrestore(&phba->hbalock, iflags);
 	if (empty)
 		lpfc_worker_wake_up(phba);
-	spin_unlock_irqrestore(&phba->hbalock, iflags);
 	return 0;
 out:
 	spin_unlock_irqrestore(&phba->hbalock, iflags);
@@ -11373,18 +11373,18 @@ lpfc_sli_post_recovery_event(struct lpfc_hba *phba,
 	unsigned long iflags;
 	struct lpfc_work_evt  *evtp = &ndlp->recovery_evt;
 
+	/* Hold a node reference for outstanding queued work */
+	if (!lpfc_nlp_get(ndlp))
+		return;
+
 	spin_lock_irqsave(&phba->hbalock, iflags);
 	if (!list_empty(&evtp->evt_listp)) {
 		spin_unlock_irqrestore(&phba->hbalock, iflags);
+		lpfc_nlp_put(ndlp);
 		return;
 	}
 
-	/* Incrementing the reference count until the queued work is done. */
-	evtp->evt_arg1  = lpfc_nlp_get(ndlp);
-	if (!evtp->evt_arg1) {
-		spin_unlock_irqrestore(&phba->hbalock, iflags);
-		return;
-	}
+	evtp->evt_arg1 = ndlp;
 	evtp->evt = LPFC_EVT_RECOVER_PORT;
 	list_add_tail(&evtp->evt_listp, &phba->work_list);
 	spin_unlock_irqrestore(&phba->hbalock, iflags);