[PATCH] bridge use read_lock when scanning device list

[Stephen Hemminger <shemminger@xxxxxxxx>]

On 2.6.1, bridge is using rtnl_shlock which is equivalent to rtnl_lock when
all it really needs to do is read_lock(&dev_base_lock).


diff -Nru a/net/bridge/br_if.c b/net/bridge/br_if.c
--- a/net/bridge/br_if.c        Mon Jan 12 13:45:44 2004
+++ b/net/bridge/br_if.c        Mon Jan 12 13:45:44 2004
@@ -252,12 +252,12 @@
        struct net_device *dev;
        int i = 0;
 
-       rtnl_shlock();
+       read_lock(&dev_base_lock);
        for (dev = dev_base; dev && i < num; dev = dev->next) {
                if (dev->priv_flags & IFF_EBRIDGE) 
                        indices[i++] = dev->ifindex;
        }
-       rtnl_shunlock();
+       read_unlock(&dev_base_lock);
 
        return i;
 }