FAILED: patch "[PATCH] RDMA/mlx4: Don't continue event handler after memory" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f3136c4ce7acf64bee43135971ca52a880572e32 Mon Sep 17 00:00:00 2001
From: Leon Romanovsky <[email protected]>
Date: Mon, 31 Jan 2022 11:45:26 +0200
Subject: [PATCH] RDMA/mlx4: Don't continue event handler after memory
allocation failure
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The failure to allocate memory during MLX4_DEV_EVENT_PORT_MGMT_CHANGE event handler will cause skip the assignment logic, but ib_dispatch_event() will be called anyway.

Fix it by calling to return instead of break after memory allocation failure.

index 1c3d97229988..93b1650eacfa 100644
@@ -3237,7 +3237,7 @@ static void mlx4_ib_event(struct mlx4_dev *dev, void *ibdev_ptr,
 	case MLX4_DEV_EVENT_PORT_MGMT_CHANGE:
 		ew = kmalloc(sizeof *ew, GFP_ATOMIC);
 		if (!ew)
-			break;
+			return;
 
 		INIT_WORK(&ew->work, handle_port_mgmt_change_event);
 		memcpy(&ew->ib_eqe, eqe, sizeof *eqe);