cnic: Improve NETDEV_UP event handling

commit db1d350f upstream.

During NETDEV_UP, we use symbol_get() to get the net driver's cnic
probe function.  This sometimes doesn't work if NETDEV_UP happens
right after NETDEV_REGISTER and the net driver is still running module
init code.  As a result, the cnic device may not be discovered.  We
fix this by probing on all NETDEV events if the device's netif_running
state is up.
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/cnic.c

@@ -2718,7 +2718,7 @@ static int cnic_netdev_event(struct notifier_block *this, unsigned long event,
 
 	dev = cnic_from_netdev(netdev);
 
-	if (!dev && (event == NETDEV_REGISTER || event == NETDEV_UP)) {
+	if (!dev && (event == NETDEV_REGISTER || netif_running(netdev))) {
 		/* Check for the hot-plug device */
 		dev = is_cnic_dev(netdev);
 		if (dev) {
@@ -2734,7 +2734,7 @@ static int cnic_netdev_event(struct notifier_block *this, unsigned long event,
 		else if (event == NETDEV_UNREGISTER)
 			cnic_ulp_exit(dev);
 
-		if (event == NETDEV_UP) {
+		if (event == NETDEV_UP || (new_dev && netif_running(netdev))) {
 			if (cnic_register_netdev(dev) != 0) {
 				cnic_put(dev);
 				goto done;