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bnx2: Try to recover from PCI block reset

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If the PCI block has reset, the memory enable bit will be reset and
the device will not respond to MMIO access.  bnx2_reset_task() currently
will not recover when this happens.  Add code to detect this condition
and restore the PCI state.  This scenario has been reported by some
users.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2012-07-16 14:25:56 +00:00 committed by David S. Miller
parent aed93e0bf4
commit efdfad3205
1 changed files with 7 additions and 0 deletions
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7
drivers/net/ethernet/broadcom/bnx2.c
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@ -6388,6 +6388,7 @@ bnx2_reset_task(struct work_struct *work)
{
struct bnx2 *bp = container_of(work, struct bnx2, reset_task);
int rc;
u16 pcicmd;
rtnl_lock();
if (!netif_running(bp->dev)) {
@ -6397,6 +6398,12 @@ bnx2_reset_task(struct work_struct *work)
bnx2_netif_stop(bp, true);
pci_read_config_word(bp->pdev, PCI_COMMAND, &pcicmd);
if (!(pcicmd & PCI_COMMAND_MEMORY)) {
/* in case PCI block has reset */
pci_restore_state(bp->pdev);
pci_save_state(bp->pdev);
}
rc = bnx2_init_nic(bp, 1);
if (rc) {
netdev_err(bp->dev, "failed to reset NIC, closing\n");