pcnet32: VLB support fixes

VLB support has been broken since at least 2004-2005 period as some
changes introduced back then assumed that ->pci_dev is always valid,
lets try to fix it:

- remove duplicated SET_NETDEV_DEV() call

- call SET_NETDEV_DEV() only for PCI devices

- check for ->pci_dev validity in pcnet32_open()

[ Alternatively we may consider removing VLB support but there would not
  be much gain in it since an extra driver code needed for VLB support is
  minimal and quite simple. ]

This takes care of the following entry from Dan's list:

drivers/net/pcnet32.c +1889 pcnet32_probe1(298) warning: variable derefenced before check 'pdev'

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by:  Don Fry <pcnet32@verizon.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c
index b61c97254b3..16964ec73e6 100644
--- a/drivers/net/pcnet32.c
+++ b/drivers/net/pcnet32.c
@@ -1722,7 +1722,9 @@ pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
                 ret = -ENOMEM;
                 goto err_release_region;
         }
-        SET_NETDEV_DEV(dev, &pdev->dev);
+
+        if (pdev)
+                SET_NETDEV_DEV(dev, &pdev->dev);
 
         if (pcnet32_debug & NETIF_MSG_PROBE)
                 printk(KERN_INFO PFX "%s at %#3lx,", chipname, ioaddr);
@@ -1821,7 +1823,6 @@ pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
 
         spin_lock_init(&lp->lock);
 
-        SET_NETDEV_DEV(dev, &pdev->dev);
         lp->name = chipname;
         lp->shared_irq = shared;
         lp->tx_ring_size = TX_RING_SIZE;        /* default tx ring size */
@@ -2085,6 +2086,7 @@ static void pcnet32_free_ring(struct net_device *dev)
 static int pcnet32_open(struct net_device *dev)
 {
         struct pcnet32_private *lp = netdev_priv(dev);
+        struct pci_dev *pdev = lp->pci_dev;
         unsigned long ioaddr = dev->base_addr;
         u16 val;
         int i;
@@ -2145,9 +2147,9 @@ static int pcnet32_open(struct net_device *dev)
         lp->a.write_csr(ioaddr, 124, val);
 
         /* Allied Telesyn AT 2700/2701 FX are 100Mbit only and do not negotiate */
-        if (lp->pci_dev->subsystem_vendor == PCI_VENDOR_ID_AT &&
-            (lp->pci_dev->subsystem_device == PCI_SUBDEVICE_ID_AT_2700FX ||
-             lp->pci_dev->subsystem_device == PCI_SUBDEVICE_ID_AT_2701FX)) {
+        if (pdev && pdev->subsystem_vendor == PCI_VENDOR_ID_AT &&
+            (pdev->subsystem_device == PCI_SUBDEVICE_ID_AT_2700FX ||
+             pdev->subsystem_device == PCI_SUBDEVICE_ID_AT_2701FX)) {
                 if (lp->options & PCNET32_PORT_ASEL) {
                         lp->options = PCNET32_PORT_FD | PCNET32_PORT_100;
                         if (netif_msg_link(lp))