e100: Fix napi_enable BUG_ON when recovering from EEH error

BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)) was being hit
during e100 EEH recovery. The problem source was a napi_enable
call being made during e100_io_error_detected. Napi should remain
disabled after e100_down, and only be reenabled when the interface
is recovered.

This patch also updates e100_io_error_detected in order to make
it similar to the current versions of the error_detected callback
in drivers such as e1000e and ixgbe.

Signed-off-by: Andre Detsch <adetsch@br.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/net/e100.c b/drivers/net/e100.c
index 0f9ee1348552..0c37dd97fa09 100644
--- a/drivers/net/e100.c
+++ b/drivers/net/e100.c
@@ -2822,12 +2822,13 @@ static pci_ers_result_t e100_io_error_detected(struct pci_dev *pdev, pci_channel
         struct net_device *netdev = pci_get_drvdata(pdev);
         struct nic *nic = netdev_priv(netdev);
 
-        /* Similar to calling e100_down(), but avoids adapter I/O. */
-        e100_close(netdev);
-
-        /* Detach; put netif into a state similar to hotplug unplug. */
-        napi_enable(&nic->napi);
         netif_device_detach(netdev);
+
+        if (state == pci_channel_io_perm_failure)
+                return PCI_ERS_RESULT_DISCONNECT;
+
+        if (netif_running(netdev))
+                e100_down(nic);
         pci_disable_device(pdev);
 
         /* Request a slot reset. */