octeon_ep: cancel tx_timeout_task later in remove sequence

tx_timeout_task is canceled too early when removing the driver. Nothing
prevents .ndo_tx_timeout from triggering and queuing the work again.

Better cancel it after the netdev is unregistered.
It's harmless for octep_tx_timeout_task to run in the window between the
unregistration and cancelation, because it checks netif_running.

Fixes: 862cd65 ("octeon_ep: Add driver framework and device initialization")
Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Link: https://lore.kernel.org/r/20230810150114.107765-3-mschmidt@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: michich

drivers/net/ethernet/marvell/octeon_ep/octep_main.c

@@ -1200,12 +1200,12 @@ static void octep_remove(struct pci_dev *pdev)
 	if (!oct)
 		return;
 
-	cancel_work_sync(&oct->tx_timeout_task);
 	cancel_work_sync(&oct->ctrl_mbox_task);
 	netdev = oct->netdev;
 	if (netdev->reg_state == NETREG_REGISTERED)
 		unregister_netdev(netdev);
 
+	cancel_work_sync(&oct->tx_timeout_task);
 	oct->poll_non_ioq_intr = false;
 	cancel_delayed_work_sync(&oct->intr_poll_task);
 	octep_device_cleanup(oct);