cnic: Improve NETDEV_UP event handling

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>

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index a529bde03c560ddc022de52143e7f959c04a1285..6c544b3411fa8f44acdfa5ffcd392e2b2ec8281e 100644 (file)
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -5342,7 +5342,7 @@ 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) {
@@ -5358,7 +5358,7 @@ 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;