e1000e: panic caused by Rx traffic arriving while interface going down
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>
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index da7f2fa..a27e3bc 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4016,6 +4016,8 @@
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 @@
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);