netdev - [PATCH v2 net-next 10/12] bnx2x: prevent race in statistics flow

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Message-ID: <1321188449-5822-11-git-send-email-dmitry@broadcom.com>
Date:	Sun, 13 Nov 2011 14:47:27 +0200
From:	"Dmitry Kravkov" <dmitry@...adcom.com>
To:	davem@...emloft.net, netdev@...r.kernel.org
cc:	"Dmitry Kravkov" <dmitry@...adcom.com>,
	"Eilon Greenstein" <eilong@...adcom.com>
Subject: [PATCH v2 net-next 10/12] bnx2x: prevent race in statistics
 flow

The race may cause access of registers while MAC hw block is
in reset state. As a result syslog will show error messages.
We can prevent this by using state from local variable.

Signed-off-by: Dmitry Kravkov <dmitry@...adcom.com>
Signed-off-by: Eilon Greenstein <eilong@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
index 02ac6a7..3034f0e 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
@@ -1349,12 +1349,14 @@ void bnx2x_stats_handle(struct bnx2x *bp, enum bnx2x_stats_event event)
 	enum bnx2x_stats_state state;
 	if (unlikely(bp->panic))
 		return;
-	bnx2x_stats_stm[bp->stats_state][event].action(bp);
+
 	spin_lock_bh(&bp->stats_lock);
 	state = bp->stats_state;
 	bp->stats_state = bnx2x_stats_stm[state][event].next_state;
 	spin_unlock_bh(&bp->stats_lock);
 
+	bnx2x_stats_stm[state][event].action(bp);
+
 	if ((event != STATS_EVENT_UPDATE) || netif_msg_timer(bp))
 		DP(BNX2X_MSG_STATS, "state %d -> event %d -> state %d\n",
 		   state, event, bp->stats_state);
-- 
1.7.7.2


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