r8169: fix setting driver_data after register_netdev

pci_set_drvdata() is called only after registering the net_device,
therefore we could run into a NPE if one of the functions using
driver_data is called before it's set.

Fix this by calling pci_set_drvdata() before registering the
net_device.

This fix is a candidate for stable. As far as I can see the
bug has been there in kernel version 3.2 already, therefore
I can't provide a reference which commit is fixed by it.

The fix may need small adjustments per kernel version because
due to other changes the label which is jumped to if
register_netdev() fails has changed over time.

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 0bf7d1759250..b4779acb6b5c 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -8660,12 +8660,12 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
         if (!tp->counters)
                 return -ENOMEM;
 
+        pci_set_drvdata(pdev, dev);
+
         rc = register_netdev(dev);
         if (rc < 0)
                 return rc;
 
-        pci_set_drvdata(pdev, dev);
-
         netif_info(tp, probe, dev, "%s at 0x%p, %pM, XID %08x IRQ %d\n",
                    rtl_chip_infos[chipset].name, ioaddr, dev->dev_addr,
                    (u32)(RTL_R32(TxConfig) & 0x9cf0f8ff), pdev->irq);