qed: Prevent probe on previous error

Don't allow driver to probe on an adapter at a failed state;
Gracefully block the probe instead.

Signed-off-by: Yuval Mintz <Yuval.Mintz@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c b/drivers/net/ethernet/qlogic/qed/qed_main.c
index 08cd92d..e4e6ca5 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -99,12 +99,15 @@ static void qed_free_pci(struct qed_dev *cdev)
        pci_disable_device(pdev);
 }
 
+#define PCI_REVISION_ID_ERROR_VAL      0xff
+
 /* Performs PCI initializations as well as initializing PCI-related parameters
  * in the device structrue. Returns 0 in case of success.
  */
 static int qed_init_pci(struct qed_dev *cdev,
                        struct pci_dev *pdev)
 {
+       u8 rev_id;
        int rc;
 
        cdev->pdev = pdev;
@@ -138,6 +141,14 @@ static int qed_init_pci(struct qed_dev *cdev,
                pci_save_state(pdev);
        }
 
+       pci_read_config_byte(pdev, PCI_REVISION_ID, &rev_id);
+       if (rev_id == PCI_REVISION_ID_ERROR_VAL) {
+               DP_NOTICE(cdev,
+                         "Detected PCI device error [rev_id 0x%x]. Probably due to prior indication. Aborting.\n",
+                         rev_id);
+               rc = -ENODEV;
+               goto err2;
+       }
        if (!pci_is_pcie(pdev)) {
                DP_NOTICE(cdev, "The bus is not PCI Express\n");
                rc = -EIO;