diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 3c75ee025bda..d63baa1b6fec 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -570,28 +570,30 @@ void inode_switch_wbs_work_fn(struct work_struct *work)
 	struct inode_switch_wbs_context *isw, *next_isw;
 	struct llist_node *list;
 
+	list = llist_del_all(&new_wb->switch_wbs_ctxs);
 	/*
-	 * Grab out reference to wb so that it cannot get freed under us
+	 * Nothing to do? That would be a problem as references held by isw
+	 * items protect wb from freeing...
+	 */
+	if (WARN_ON_ONCE(!list))
+		return;
+
+	/*
+	 * Grab our reference to wb so that it cannot get freed under us
 	 * after we process all the isw items.
 	 */
 	wb_get(new_wb);
-	while (1) {
-		list = llist_del_all(&new_wb->switch_wbs_ctxs);
-		/* Nothing to do? */
-		if (!list)
-			break;
-		/*
-		 * In addition to synchronizing among switchers, I_WB_SWITCH
-		 * tells the RCU protected stat update paths to grab the i_page
-		 * lock so that stat transfer can synchronize against them.
-		 * Let's continue after I_WB_SWITCH is guaranteed to be
-		 * visible.
-		 */
-		synchronize_rcu();
+	/*
+	 * In addition to synchronizing among switchers, I_WB_SWITCH
+	 * tells the RCU protected stat update paths to grab the i_page
+	 * lock so that stat transfer can synchronize against them.
+	 * Let's continue after I_WB_SWITCH is guaranteed to be
+	 * visible.
+	 */
+	synchronize_rcu();
 
-		llist_for_each_entry_safe(isw, next_isw, list, list)
-			process_inode_switch_wbs(new_wb, isw);
-	}
+	llist_for_each_entry_safe(isw, next_isw, list, list)
+		process_inode_switch_wbs(new_wb, isw);
 	wb_put(new_wb);
 }