netdev - [net-next 02/10] ixgbe: prevent link checks while resetting

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Date:	Wed,  5 Oct 2011 03:20:16 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Emil Tantilov <emil.s.tantilov@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 02/10] ixgbe: prevent link checks while resetting

From: Emil Tantilov <emil.s.tantilov@...el.com>

It some situations the driver sets __IXGBE_RESETTING and then
__IXGBE_DOWN flags. It is possible a link check may sneak in
between.

This patch adds check for both flags.
The idea is to reduce register reads while the PHY is resetting.

Signed-off-by: Emil Tantilov <emil.s.tantilov@...el.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 9cd44ad..ed92272 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -5978,7 +5978,8 @@ static void ixgbe_spoof_check(struct ixgbe_adapter *adapter)
 static void ixgbe_watchdog_subtask(struct ixgbe_adapter *adapter)
 {
 	/* if interface is down do nothing */
-	if (test_bit(__IXGBE_DOWN, &adapter->state))
+	if (test_bit(__IXGBE_DOWN, &adapter->state) ||
+	    test_bit(__IXGBE_RESETTING, &adapter->state))
 		return;
 
 	ixgbe_watchdog_update_link(adapter);
-- 
1.7.6.4

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