sky2: fix oops on shutdown

If the device is fails during module startup for some reason like
unsupported chip version then the driver would crash dereferencing a
null pointer, on shutdown or suspend/resume.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index a307310f13f5e7c6ef05fea1126fdbb3928cdabf..3764008270a223eb816839069d7fc05987b44f49 100644 (file)
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -3732,6 +3732,7 @@ err_out_free_regions:
 err_out_disable:
        pci_disable_device(pdev);
 err_out:
+       pci_set_drvdata(pdev, NULL);
        return err;
 }
 
@@ -3784,6 +3785,9 @@ static int sky2_suspend(struct pci_dev *pdev, pm_message_t state)
        struct sky2_hw *hw = pci_get_drvdata(pdev);
        int i, wol = 0;
 
+       if (!hw)
+               return 0;
+
        del_timer_sync(&hw->idle_timer);
        netif_poll_disable(hw->dev[0]);
 
@@ -3815,6 +3819,9 @@ static int sky2_resume(struct pci_dev *pdev)
        struct sky2_hw *hw = pci_get_drvdata(pdev);
        int i, err;
 
+       if (!hw)
+               return 0;
+
        err = pci_set_power_state(pdev, PCI_D0);
        if (err)
                goto out;
@@ -3861,6 +3868,9 @@ static void sky2_shutdown(struct pci_dev *pdev)
        struct sky2_hw *hw = pci_get_drvdata(pdev);
        int i, wol = 0;
 
+       if (!hw)
+               return;
+
        del_timer_sync(&hw->idle_timer);
        netif_poll_disable(hw->dev[0]);