bna: Clear Driver Config Flags When HW Resets

Driver configuration flags are retained across open/stop operations preventing
configurations to be set in next open/stop. Setting MTU on a 1020 causes
network to fail until a reboot is performed on the host.

Clear the flags when configuration resets in hardware.
Signed-off-by: NRasesh Mody <rmody@brocade.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/brocade/bna/bnad.c

@@ -2624,6 +2624,9 @@ bnad_stop(struct net_device *netdev)
 	bnad_destroy_tx(bnad, 0);
 	bnad_destroy_rx(bnad, 0);
 
+	/* These config flags are cleared in the hardware */
+	bnad->cfg_flags &= ~(BNAD_CF_ALLMULTI | BNAD_CF_PROMISC);
+
 	/* Synchronize mailbox IRQ */
 	bnad_mbox_irq_sync(bnad);