cxgb3 - avoid deadlock with mac watchdog

Fix a deadlock when the interface s configured down and
the watchdog tack is sleeping on rtnl_lock.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 26240fd5e76..c6ebe25464c 100644
--- a/drivers/net/cxgb3/cxgb3_main.c
+++ b/drivers/net/cxgb3/cxgb3_main.c
@@ -2119,7 +2119,9 @@ static void check_t3b2_mac(struct adapter *adapter)
 {
         int i;
 
-        rtnl_lock();                      /* synchronize with ifdown */
+        if (!rtnl_trylock())    /* synchronize with ifdown */
+                return;
+
         for_each_port(adapter, i) {
                 struct net_device *dev = adapter->port[i];
                 struct port_info *p = netdev_priv(dev);