cmd640: fix kernel oops in test_irq() method

When implementing the test_iqr() method, I forgot that this driver is not an
ordinary PCI driver and also needs to support VLB variant of the chip. Moreover,
'hwif->dev' should be NULL, potentially causing oops in pci_read_config_byte().

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/ide/cmd640.c b/drivers/ide/cmd640.c
index d2b8b272bc27..cb10201a15ed 100644
--- a/drivers/ide/cmd640.c
+++ b/drivers/ide/cmd640.c
@@ -633,12 +633,10 @@ static void __init cmd640_init_dev(ide_drive_t *drive)
 
 static int cmd640_test_irq(ide_hwif_t *hwif)
 {
-        struct pci_dev *dev     = to_pci_dev(hwif->dev);
         int irq_reg             = hwif->channel ? ARTTIM23 : CFR;
-        u8  irq_stat, irq_mask  = hwif->channel ? ARTTIM23_IDE23INTR :
+        u8  irq_mask            = hwif->channel ? ARTTIM23_IDE23INTR :
                                                   CFR_IDE01INTR;
-
-        pci_read_config_byte(dev, irq_reg, &irq_stat);
+        u8  irq_stat            = get_cmd640_reg(irq_reg);
 
         return (irq_stat & irq_mask) ? 1 : 0;
 }