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cmd640: fix kernel oops in test_irq() method

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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>
This commit is contained in:
Sergei Shtylyov 2010-05-11 00:08:03 -07:00 committed by David S. Miller
parent f693be4d8a
commit a9ddabc52c
1 changed files with 2 additions and 4 deletions
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6
drivers/ide/cmd640.c
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@ -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;
}