bnxt_en: Fix PCI AER error recovery flow

[ Upstream commit df3875ec550396974b1d8a518bd120d034738236 ]

When a PCI error is detected the PCI state could be corrupt, save
the PCI state after initialization and restore it after the slot
reset.

Fixes: 6316ea6db93d ("bnxt_en: Enable AER support.")
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 421cbba..f451be6 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7085,6 +7085,7 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
        bnxt_parse_log_pcie_link(bp);
 
+       pci_save_state(pdev);
        return 0;
 
 init_err:
@@ -7158,6 +7159,8 @@ static pci_ers_result_t bnxt_io_slot_reset(struct pci_dev *pdev)
                        "Cannot re-enable PCI device after reset.\n");
        } else {
                pci_set_master(pdev);
+               pci_restore_state(pdev);
+               pci_save_state(pdev);
 
                if (netif_running(netdev))
                        err = bnxt_open(netdev);