1 files changed, 63 insertions, 31 deletions

diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c
index 692c6535fe75..75efdbc54ef8 100644
--- a/drivers/scsi/fcoe/fcoe_ctlr.c
+++ b/drivers/scsi/fcoe/fcoe_ctlr.c
@@ -160,10 +160,16 @@ void fcoe_ctlr_init(struct fcoe_ctlr *fip, enum fip_state mode)
 }
 EXPORT_SYMBOL(fcoe_ctlr_init);
 
+/**
+ * fcoe_sysfs_fcf_add() - Add a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
+ * @new: The newly discovered FCF
+ *
+ * Called with fip->ctlr_mutex held
+ */
 static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
 {
 	struct fcoe_ctlr *fip = new->fip;
-	struct fcoe_ctlr_device *ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
+	struct fcoe_ctlr_device *ctlr_dev;
 	struct fcoe_fcf_device *temp, *fcf_dev;
 	int rc = -ENOMEM;
 
@@ -174,8 +180,6 @@ static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
 	if (!temp)
 		goto out;
 
-	mutex_lock(&ctlr_dev->lock);
-
 	temp->fabric_name = new->fabric_name;
 	temp->switch_name = new->switch_name;
 	temp->fc_map = new->fc_map;
@@ -185,55 +189,83 @@ static int fcoe_sysfs_fcf_add(struct fcoe_fcf *new)
 	temp->fka_period = new->fka_period;
 	temp->selected = 0; /* default to unselected */
 
-	fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp);
-	if (unlikely(!fcf_dev))
-		goto unlock;
-
 	/*
-	 * The fcoe_sysfs layer can return a CONNECTED fcf that
-	 * has a priv (fcf was never deleted) or a CONNECTED fcf
-	 * that doesn't have a priv (fcf was deleted). However,
-	 * libfcoe will always delete FCFs before trying to add
-	 * them. This is ensured because both recv_adv and
-	 * age_fcfs are protected by the the fcoe_ctlr's mutex.
-	 * This means that we should never get a FCF with a
-	 * non-NULL priv pointer.
+	 * If ctlr_dev doesn't exist then it means we're a libfcoe user
+	 * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device.
+	 * fnic would be an example of a driver with this behavior. In this
+	 * case we want to add the fcoe_fcf to the fcoe_ctlr list, but we
+	 * don't want to make sysfs changes.
 	 */
-	BUG_ON(fcf_dev->priv);
 
-	fcf_dev->priv = new;
-	new->fcf_dev = fcf_dev;
+	ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
+	if (ctlr_dev) {
+		mutex_lock(&ctlr_dev->lock);
+		fcf_dev = fcoe_fcf_device_add(ctlr_dev, temp);
+		if (unlikely(!fcf_dev)) {
+			rc = -ENOMEM;
+			goto out;
+		}
+
+		/*
+		 * The fcoe_sysfs layer can return a CONNECTED fcf that
+		 * has a priv (fcf was never deleted) or a CONNECTED fcf
+		 * that doesn't have a priv (fcf was deleted). However,
+		 * libfcoe will always delete FCFs before trying to add
+		 * them. This is ensured because both recv_adv and
+		 * age_fcfs are protected by the the fcoe_ctlr's mutex.
+		 * This means that we should never get a FCF with a
+		 * non-NULL priv pointer.
+		 */
+		BUG_ON(fcf_dev->priv);
+
+		fcf_dev->priv = new;
+		new->fcf_dev = fcf_dev;
+		mutex_unlock(&ctlr_dev->lock);
+	}
 
 	list_add(&new->list, &fip->fcfs);
 	fip->fcf_count++;
 	rc = 0;
 
-unlock:
-	mutex_unlock(&ctlr_dev->lock);
-
 out:
 	kfree(temp);
 	return rc;
 }
 
+/**
+ * fcoe_sysfs_fcf_del() - Remove a fcoe_fcf{,_device} to a fcoe_ctlr{,_device}
+ * @new: The FCF to be removed
+ *
+ * Called with fip->ctlr_mutex held
+ */
 static void fcoe_sysfs_fcf_del(struct fcoe_fcf *new)
 {
 	struct fcoe_ctlr *fip = new->fip;
-	struct fcoe_ctlr_device *ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);
+	struct fcoe_ctlr_device *cdev;
 	struct fcoe_fcf_device *fcf_dev;
 
 	list_del(&new->list);
 	fip->fcf_count--;
 
-	mutex_lock(&ctlr_dev->lock);
-
-	fcf_dev = fcoe_fcf_to_fcf_dev(new);
-	WARN_ON(!fcf_dev);
-	new->fcf_dev = NULL;
-	fcoe_fcf_device_delete(fcf_dev);
-	kfree(new);
-
-	mutex_unlock(&ctlr_dev->lock);
+	/*
+	 * If ctlr_dev doesn't exist then it means we're a libfcoe user
+	 * who doesn't use fcoe_syfs and didn't allocate a fcoe_ctlr_device
+	 * or a fcoe_fcf_device.
+	 *
+	 * fnic would be an example of a driver with this behavior. In this
+	 * case we want to remove the fcoe_fcf from the fcoe_ctlr list (above),
+	 * but we don't want to make sysfs changes.
+	 */
+	cdev = fcoe_ctlr_to_ctlr_dev(fip);
+	if (cdev) {
+		mutex_lock(&cdev->lock);
+		fcf_dev = fcoe_fcf_to_fcf_dev(new);
+		WARN_ON(!fcf_dev);
+		new->fcf_dev = NULL;
+		fcoe_fcf_device_delete(fcf_dev);
+		kfree(new);
+		mutex_unlock(&cdev->lock);
+	}
 }
 
 /**