netdev - [PATCH net 4/5] tg3: Fix race condition in tg3_get

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Message-ID: <1343625345-5155-4-git-send-email-mchan@broadcom.com>
Date:	Sun, 29 Jul 2012 22:15:44 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	davem@...emloft.net
cc:	netdev@...r.kernel.org
Subject: [PATCH net 4/5] tg3: Fix race condition in tg3_get_stats64()

Spinlock should be taken before checking for tp->hw_stats.

Signed-off-by: Michael Chan <mchan@...adcom.com>
---
 drivers/net/ethernet/broadcom/tg3.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 50045ed..f03614b 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -12524,10 +12524,12 @@ static struct rtnl_link_stats64 *tg3_get_stats64(struct net_device *dev,
 {
 	struct tg3 *tp = netdev_priv(dev);
 
-	if (!tp->hw_stats)
+	spin_lock_bh(&tp->lock);
+	if (!tp->hw_stats) {
+		spin_unlock_bh(&tp->lock);
 		return &tp->net_stats_prev;
+	}
 
-	spin_lock_bh(&tp->lock);
 	tg3_get_nstats(tp, stats);
 	spin_unlock_bh(&tp->lock);
 
-- 
1.7.1


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