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e1000e: panic caused by Rx traffic arriving while interface going down

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An "unable to handle kernel paging request" panic can occur when receiving
traffic while the interface is going down.  Wait for NAPI to be done with
current context after disabling interrupts and then disable NAPI.

See https://bugzilla.vyatta.com/show_bug.cgi?id=8837.

Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Bruce Allan 2013-04-20 05:37:29 +00:00 committed by Jeff Kirsher
parent 73e3dd6b45
commit a3b87a4c69
1 changed files with 5 additions and 2 deletions
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7
drivers/net/ethernet/intel/e1000e/netdev.c
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@ -4016,6 +4016,8 @@ void e1000e_down(struct e1000_adapter *adapter)
e1000_irq_disable(adapter);
napi_synchronize(&adapter->napi);
del_timer_sync(&adapter->watchdog_timer);
del_timer_sync(&adapter->phy_info_timer);
@ -4372,12 +4374,13 @@ 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);
}
napi_disable(&adapter->napi);
e1000_power_down_phy(adapter);
e1000e_free_tx_resources(adapter->tx_ring);