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igb: make certain to reassign legacy interrupt vectors after reset

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This change corrects an issue that will cause false hangs when using either
82575 or 82580 in legacy interrupt mode.  The issue is caused when there is
a slow traffic flow and an "ethtool -r" is executed while using legacy or
MSI interrupts.  MSI-X is not affected by this issue due to the fact that
we were already reconfiguring the vectors after reset.

If possible it would be best to push this for net-2.6 since it is resolving
a bug but if that is not possible then net-next-2.6 will be fine.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2010-02-03 21:59:51 +00:00 committed by David S. Miller
parent 3fdde0a160
commit feeb2721a7
1 changed files with 5 additions and 15 deletions
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20
drivers/net/igb/igb_main.c
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@ -421,6 +421,8 @@ static void igb_assign_vector(struct igb_q_vector *q_vector, int msix_vector)
msixbm = E1000_EICR_RX_QUEUE0 << rx_queue;
if (tx_queue > IGB_N0_QUEUE)
msixbm |= E1000_EICR_TX_QUEUE0 << tx_queue;
if (!adapter->msix_entries && msix_vector == 0)
msixbm |= E1000_EIMS_OTHER;
array_wr32(E1000_MSIXBM(0), msix_vector, msixbm);
q_vector->eims_value = msixbm;
break;
@ -877,7 +879,6 @@ static int igb_request_irq(struct igb_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct pci_dev *pdev = adapter->pdev;
struct e1000_hw *hw = &adapter->hw;
int err = 0;
if (adapter->msix_entries) {
@ -909,20 +910,7 @@ static int igb_request_irq(struct igb_adapter *adapter)
igb_setup_all_tx_resources(adapter);
igb_setup_all_rx_resources(adapter);
} else {
switch (hw->mac.type) {
case e1000_82575:
wr32(E1000_MSIXBM(0),
(E1000_EICR_RX_QUEUE0 |
E1000_EICR_TX_QUEUE0 |
E1000_EIMS_OTHER));
break;
case e1000_82580:
case e1000_82576:
wr32(E1000_IVAR0, E1000_IVAR_VALID);
break;
default:
break;
}
igb_assign_vector(adapter->q_vector[0], 0);
}
if (adapter->flags & IGB_FLAG_HAS_MSI) {
@ -1140,6 +1128,8 @@ int igb_up(struct igb_adapter *adapter)
}
if (adapter->msix_entries)
igb_configure_msix(adapter);
else
igb_assign_vector(adapter->q_vector[0], 0);
/* Clear any pending interrupts. */
rd32(E1000_ICR);