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Date:	Sat,  3 Dec 2011 03:44:27 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Bruce Allan <bruce.w.allan@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	Mike McElroy <mike.mcelroy@...atus.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 2/6] e1000e: hitting BUG_ON() from napi_enable

From: Bruce Allan <bruce.w.allan@...el.com>

Based on a patch from Mike McElroy created against the out-of-tree e1000e
driver:

Hitting the BUG_ON in napi_enable(). Code inspection shows that this can
only be triggered by calling napi_enable() twice without an intervening
napi_disable().

I saw the following sequence of events in the stack trace:

1) We simulated a cable pull using an Extreme switch.
2) e1000_tx_timeout() was entered.
3) e1000_reset_task() was called. Saw the message from e_err() in the
console log.
4) e1000_reinit_locked was called. This function calls e1000_down() and
e1000_up(). These functions call napi_disable() and napi_enable()
respectively.
5) Then on another thread, a monitor task saw carrier was down and executed
'ip set link down' and 'ip set link up' commands.
6) Saw the '_E1000_RESETTING'warning fron the e1000_close function.
7) Either the e1000_open() executed between the e1000_down() and e1000_up()
calls in step 4 or the e1000_open() call executed after the e1000_up()
call.  In either case, napi_enable() is called twice which triggers the
BUG_ON.

Signed-off-by: Bruce Allan <bruce.w.allan@...el.com>
Cc: Mike McElroy <mike.mcelroy@...atus.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 3c12e6a..ef6546f 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -3516,7 +3516,6 @@ int e1000e_up(struct e1000_adapter *adapter)
 
 	clear_bit(__E1000_DOWN, &adapter->state);
 
-	napi_enable(&adapter->napi);
 	if (adapter->msix_entries)
 		e1000_configure_msix(adapter);
 	e1000_irq_enable(adapter);
@@ -3578,7 +3577,6 @@ void e1000e_down(struct e1000_adapter *adapter)
 	e1e_flush();
 	usleep_range(10000, 20000);
 
-	napi_disable(&adapter->napi);
 	e1000_irq_disable(adapter);
 
 	del_timer_sync(&adapter->watchdog_timer);
@@ -3901,6 +3899,8 @@ static int e1000_close(struct net_device *netdev)
 
 	pm_runtime_get_sync(&pdev->dev);
 
+	napi_disable(&adapter->napi);
+
 	if (!test_bit(__E1000_DOWN, &adapter->state)) {
 		e1000e_down(adapter);
 		e1000_free_irq(adapter);
-- 
1.7.6.4

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