be2net: Signal that the device cannot transmit during reconfiguration

[ Upstream commit 7429c6c0d9cb086d8e79f0d2a48ae14851d2115e ]

While changing the number of interrupt channels, be2net stops adapter
operation (including netif_tx_disable()) but it doesn't signal that it
cannot transmit. This may lead dev_watchdog() to falsely trigger during
that time.

Add the missing call to netif_carrier_off(), following the pattern used in
many other drivers. netif_carrier_on() is already taken care of in
be_open().

Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/ethernet/emulex/benet/be_main.c

@@ -4700,8 +4700,12 @@ int be_update_queues(struct be_adapter *adapter)
 	struct net_device *netdev = adapter->netdev;
 	int status;
 
-	if (netif_running(netdev))
+	if (netif_running(netdev)) {
+		/* device cannot transmit now, avoid dev_watchdog timeouts */
+		netif_carrier_off(netdev);
+
 		be_close(netdev);
+	}
 
 	be_cancel_worker(adapter);