pcmcia: do not load the pd6729 driver if io_base is NULL

The CL-PD6729 chip in some docking station is not initialized properly
under Linux. In that case, do not load the pd6729 driver.

[Dominik Brodowski <linux@dominikbrodowski.net>: spelling fixes, check for NULL not 0]
Signed-off-by: Komuro <komurojun-mbn@nifty.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/pcmcia/pd6729.c b/drivers/pcmcia/pd6729.c
index 1c39d3438f20..70a33468bcd0 100644
--- a/drivers/pcmcia/pd6729.c
+++ b/drivers/pcmcia/pd6729.c
@@ -641,6 +641,12 @@ static int __devinit pd6729_pci_probe(struct pci_dev *dev,
         if ((ret = pci_enable_device(dev)))
                 goto err_out_free_mem;
 
+        if (!pci_resource_start(dev, 0)) {
+                printk(KERN_INFO "pd6729: refusing to load the driver "
+                                 "as the io_base is 0.\n");
+                goto err_out_free_mem;
+        }
+
         printk(KERN_INFO "pd6729: Cirrus PD6729 PCI to PCMCIA Bridge "
                 "at 0x%llx on irq %d\n",
                 (unsigned long long)pci_resource_start(dev, 0), dev->irq);