bnx2: Try to recover from PCI block reset
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>
diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index 0ced154..79cebd8 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -6388,6 +6388,7 @@
{
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_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");