linux-kernel - [PATCH 1/3] net: mv643xx_eth: update statistics timer from timer context only

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Date:	Wed,  2 Oct 2013 12:57:20 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Jason Cooper <jason@...edaemon.net>, netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] net: mv643xx_eth: update statistics timer from timer context only

Each port driver installs a periodic timer to update port statistics
by calling mib_counters_update. As mib_counters_update is also called
from non-timer context, we should not reschedule the timer there but
rather move it to timer-only context.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
---
Cc: David Miller <davem@...emloft.net>
Cc: Lennert Buytenhek <buytenh@...tstofly.org>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: netdev@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/ethernet/marvell/mv643xx_eth.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 7fb5677..44a87e4 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -1131,15 +1131,13 @@ static void mib_counters_update(struct mv643xx_eth_private *mp)
 	p->rx_discard += rdlp(mp, RX_DISCARD_FRAME_CNT);
 	p->rx_overrun += rdlp(mp, RX_OVERRUN_FRAME_CNT);
 	spin_unlock_bh(&mp->mib_counters_lock);
-
-	mod_timer(&mp->mib_counters_timer, jiffies + 30 * HZ);
 }
 
 static void mib_counters_timer_wrapper(unsigned long _mp)
 {
 	struct mv643xx_eth_private *mp = (void *)_mp;
-
 	mib_counters_update(mp);
+	mod_timer(&mp->mib_counters_timer, jiffies + 30 * HZ);
 }
 
 
-- 
1.7.10.4

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