octeon_ep_vf: Resolve netdevice usage count issue

The netdevice usage count increases during transmit queue timeouts
because netdev_hold is called in ndo_tx_timeout, scheduling a task
to reinitialize the card. Although netdev_put is called at the end
of the scheduled work, rtnl_unlock checks the reference count during
cleanup. This could cause issues if transmit timeout is called on
multiple queues.

Fixes: cb7dd71 ("octeon_ep_vf: Add driver framework and device initialization")
Signed-off-by: Sathesh B Edara <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Sathesh B Edara

drivers/net/ethernet/marvell/octeon_ep_vf/octep_vf_main.c

@@ -835,7 +835,9 @@ static void octep_vf_tx_timeout(struct net_device *netdev, unsigned int txqueue)
 	struct octep_vf_device *oct = netdev_priv(netdev);
 
 	netdev_hold(netdev, NULL, GFP_ATOMIC);
-	schedule_work(&oct->tx_timeout_task);
+	if (!schedule_work(&oct->tx_timeout_task))
+		netdev_put(netdev, NULL);
+
 }
 
 static int octep_vf_set_mac(struct net_device *netdev, void *p)