net: hns3: add a check to pointer in error_detected and slot_reset

If we add a VF without loading hclgevf.ko and then there is a RAS error
occurs, PCIe AER will call error_detected and slot_reset of all functions,
and will get a NULL pointer when we check ad_dev->ops->handle_hw_ras_error.
This will cause a call trace and failures on handling of follow-up RAS
errors.

This patch check ae_dev and ad_dev->ops at first to solve above issues.

Signed-off-by: Weihang Li <liweihang@hisilicon.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 1e68bcb..0501b78 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1920,9 +1920,9 @@ static pci_ers_result_t hns3_error_detected(struct pci_dev *pdev,
        if (state == pci_channel_io_perm_failure)
                return PCI_ERS_RESULT_DISCONNECT;
 
-       if (!ae_dev) {
+       if (!ae_dev || !ae_dev->ops) {
                dev_err(&pdev->dev,
-                       "Can't recover - error happened during device init\n");
+                       "Can't recover - error happened before device initialized\n");
                return PCI_ERS_RESULT_NONE;
        }
 
@@ -1941,6 +1941,9 @@ static pci_ers_result_t hns3_slot_reset(struct pci_dev *pdev)
 
        dev_info(dev, "requesting reset due to PCI error\n");
 
+       if (!ae_dev || !ae_dev->ops)
+               return PCI_ERS_RESULT_NONE;
+
        /* request the reset */
        if (ae_dev->ops->reset_event) {
                if (!ae_dev->override_pci_need_reset)