[PATCH] bpqether add rcu_read_lock

[Stephen Hemminger <shemminger@xxxxxxxx>]

Fix one comment and add rcu_read_lock/rcu_read_unlock in the 
net_device_notifier.
Preemption is almost certainly already disabled there, but be safe.

diff -Nru a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
--- a/drivers/net/hamradio/bpqether.c   Tue Aug 12 11:37:28 2003
+++ b/drivers/net/hamradio/bpqether.c   Tue Aug 12 11:37:28 2003
@@ -141,7 +141,6 @@
 
 /*
  *     Get the BPQ device for the ethernet device
- * need to hold bqp_lock at least for read
  */
 static inline struct net_device *bpq_get_ax25_dev(struct net_device *dev)
 {
@@ -564,6 +563,8 @@
        if (!dev_is_ethdev(dev))
                return NOTIFY_DONE;
 
+       rcu_read_lock();
+
        switch (event) {
        case NETDEV_UP:         /* new ethernet device -> new BPQ interface */
                if (bpq_get_ax25_dev(dev) == NULL)
@@ -582,6 +583,7 @@
        default:
                break;
        }
+       rcu_read_unlock();
 
        return NOTIFY_DONE;
 }