[PATCH] bridge deadlock on device removal

[Stephen Hemminger <shemminger@xxxxxxxx>]

Fixes: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=131569
Dead lock in bridge when removing device interface module. br_del_if
assumes br->lock not held.

This fixes case of:
        brctl addbr b0
        brctl addif b0 eth0
        rmmod eth0

Signed-off-by: Stephen Hemminger <shemminger@xxxxxxxx>

diff -Nru a/net/bridge/br_notify.c b/net/bridge/br_notify.c
--- a/net/bridge/br_notify.c    2004-09-06 04:45:31 -07:00
+++ b/net/bridge/br_notify.c    2004-09-06 04:45:31 -07:00
@@ -76,10 +76,12 @@
                break;
 
        case NETDEV_UNREGISTER:
+               spin_unlock_bh(&br->lock);
                br_del_if(br, dev);
-               break;
+               goto done;
        } 
        spin_unlock_bh(&br->lock);
 
+ done:
        return NOTIFY_DONE;
 }