net: Detect and ignore netif_stop_queue() calls before register_netdev()

After e6484930d7c73d324bccda7d43d131088da697b9: net: allocate tx queues in register_netdevice
These calls make net drivers oops at load time, so let's avoid people
git-bisect'ing known problems.

Signed-off-by: Guillaume Chazarain <guichaz@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 072652d94d9f5afe908f982c1acce9339bfbfc32..d8fd2c23a1b994ec10e0a204820d6c7daf7dca0e 100644 (file)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1554,6 +1554,11 @@ static inline void netif_tx_wake_all_queues(struct net_device *dev)
 
 static inline void netif_tx_stop_queue(struct netdev_queue *dev_queue)
 {
+       if (WARN_ON(!dev_queue)) {
+               printk(KERN_INFO "netif_stop_queue() cannot be called before "
+                      "register_netdev()");
+               return;
+       }
        set_bit(__QUEUE_STATE_XOFF, &dev_queue->state);
 }