netdev - [net-next-2.6 08/24] e1000e: fix stats locking in e1000_watchdog

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Date:	Wed, 13 Apr 2011 18:02:04 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Flavio Leitner <fleitner@...hat.com>, netdev@...r.kernel.org,
	gospo@...hat.com, bphilips@...ell.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next-2.6 08/24] e1000e: fix stats locking in e1000_watchdog_task

From: Flavio Leitner <fleitner@...hat.com>

Just move the unlock down a bit because it unlocks too
early leaving a chance for get_stats64() run in parallel
while it is still accessing the stats.

Signed-off-by: Flavio Leitner <fleitner@...hat.com>
Acked-by: Bruce Allan <bruce.w.allan@...el.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/e1000e/netdev.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
index 8812eb2..8a3145e 100644
--- a/drivers/net/e1000e/netdev.c
+++ b/drivers/net/e1000e/netdev.c
@@ -4339,7 +4339,6 @@ static void e1000_watchdog_task(struct work_struct *work)
 link_up:
 	spin_lock(&adapter->stats64_lock);
 	e1000e_update_stats(adapter);
-	spin_unlock(&adapter->stats64_lock);
 
 	mac->tx_packet_delta = adapter->stats.tpt - adapter->tpt_old;
 	adapter->tpt_old = adapter->stats.tpt;
@@ -4350,6 +4349,7 @@ link_up:
 	adapter->gorc_old = adapter->stats.gorc;
 	adapter->gotc = adapter->stats.gotc - adapter->gotc_old;
 	adapter->gotc_old = adapter->stats.gotc;
+	spin_unlock(&adapter->stats64_lock);
 
 	e1000e_update_adaptive(&adapter->hw);
 
-- 
1.7.4.2

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