---

yaml
---
r: 291619
b: refs/heads/master
c: 58a3de0
h: refs/heads/master
i:
  291617: 2400a28
  291615: e96031c
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1c3ac4289a0e4d60cbd4787b4a91de4a0c785df1
+refs/heads/master: 58a3de0592454c216c68427fa3c31a34823f5115

trunk/drivers/net/ethernet/mellanox/mlx4/cmd.c

@@ -239,6 +239,7 @@ static int mlx4_comm_cmd_wait(struct mlx4_dev *dev, u8 op,
 {
 	struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
 	struct mlx4_cmd_context *context;
+	unsigned long end;
 	int err = 0;
 
 	down(&cmd->event_sem);
@@ -268,6 +269,14 @@ static int mlx4_comm_cmd_wait(struct mlx4_dev *dev, u8 op,
 	}
 
 out:
+	/* wait for comm channel ready
+	 * this is necessary for prevention the race
+	 * when switching between event to polling mode
+	 */
+	end = msecs_to_jiffies(timeout) + jiffies;
+	while (comm_pending(dev) && time_before(jiffies, end))
+		cond_resched();
+
 	spin_lock(&cmd->context_lock);
 	context->next = cmd->free_head;
 	cmd->free_head = context - cmd->context;