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sgiioc4: add missing ->dma_base check 

If ->dma_base is not set (== PCI BAR4 cannot be reserved) then DMA hooks
shouldn't be initialized or bad things will happen.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-10-13 17:47:52 +02:00
parent 7bda292d12
commit b9d9e61abb
1 changed files with 10 additions and 6 deletions
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16
drivers/ide/pci/sgiioc4.c
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@ -587,8 +587,6 @@ static void __devinit
ide_init_sgiioc4(ide_hwif_t * hwif)
{
hwif->mmio = 1;
hwif->atapi_dma = 1;
hwif->mwdma_mask = 0x04;
hwif->pio_mask = 0x00;
hwif->set_pio_mode = NULL; /* Sets timing for PIO mode */
hwif->set_dma_mode = &sgiioc4_set_dma_mode;
@ -602,6 +600,14 @@ ide_init_sgiioc4(ide_hwif_t * hwif)
hwif->quirkproc = NULL;
hwif->busproc = NULL;
hwif->INB = &sgiioc4_INB;
if (hwif->dma_base == 0)
return;
hwif->atapi_dma = 1;
hwif->mwdma_mask = 0x04;
hwif->dma_setup = &sgiioc4_ide_dma_setup;
hwif->dma_start = &sgiioc4_ide_dma_start;
hwif->ide_dma_end = &sgiioc4_ide_dma_end;
@ -613,8 +619,6 @@ ide_init_sgiioc4(ide_hwif_t * hwif)
hwif->dma_host_off = &sgiioc4_dma_host_off;
hwif->dma_lost_irq = &sgiioc4_dma_lost_irq;
hwif->dma_timeout = &ide_dma_timeout;
hwif->INB = &sgiioc4_INB;
}
static int __devinit
@ -684,8 +688,6 @@ sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
/* Initializing chipset IRQ Registers */
writel(0x03, (void __iomem *)(irqport + IOC4_INTR_SET * 4));
ide_init_sgiioc4(hwif);
hwif->autodma = 0;
if (dma_base && ide_dma_sgiioc4(hwif, dma_base) == 0) {
@ -695,6 +697,8 @@ sgiioc4_ide_setup_pci_device(struct pci_dev *dev)
printk(KERN_INFO "%s: %s Bus-Master DMA disabled\n",
hwif->name, DRV_NAME);
ide_init_sgiioc4(hwif);
if (probe_hwif_init(hwif))
return -EIO;