From: Divy Le Ray <divy@chelsio.com>
Date: Tue, 10 Apr 2007 03:10:22 +0000 (-0700)
Subject: cxgb3 - avoid deadlock with mac watchdog
X-Git-Tag: upstream/snapshot3+hdmi~35075^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f2d961c9827bab4b64a1b4ea30c68cf5ab2b2330;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

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>
---

diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
index 26240fd..c6ebe25 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);