netdev - [net-next 09/12] igb: Fix possible panic caused by Rx traffic arrival while interface is down

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Message-Id: <1369173800-20326-10-git-send-email-jeffrey.t.kirsher@intel.com>
Date:	Tue, 21 May 2013 15:03:17 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 09/12] igb: Fix possible panic caused by Rx traffic arrival while interface is down

From: Carolyn Wyborny <carolyn.wyborny@...el.com>

This patch reorders disabling napi and irqs during igb_down.
This is done to avoid possible panic's found in other Intel drivers
when Rx traffic arrives while interface is going down.

Signed-off-by: Carolyn Wyborny <carolyn.wyborny@...el.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 2c8f7e0..6a0c1b6 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1667,10 +1667,13 @@ void igb_down(struct igb_adapter *adapter)
 	wrfl();
 	msleep(10);
 
-	for (i = 0; i < adapter->num_q_vectors; i++)
+	igb_irq_disable(adapter);
+
+	for (i = 0; i < adapter->num_q_vectors; i++) {
+		napi_synchronize(&(adapter->q_vector[i]->napi));
 		napi_disable(&(adapter->q_vector[i]->napi));
+	}
 
-	igb_irq_disable(adapter);
 
 	del_timer_sync(&adapter->watchdog_timer);
 	del_timer_sync(&adapter->phy_info_timer);
-- 
1.7.11.7

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