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[libata] fix oops on non-DMA bmdma hardware 

Alan noted: "bmdma may be zero but the bmdma_irq_clear function gets
called even in this case during pure PIO operation. Check we have a
bmdma before we use it."

I fixed this by adding a check for zero.  While was I there, I fixed the
non-standard indentation of the small function's code.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Jeff Garzik 2006-03-21 21:31:22 -05:00
parent 17bb34a3c5
commit 4d4681f6b9
1 changed files with 10 additions and 7 deletions
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17
drivers/scsi/libata-core.c
View File

@ -4202,14 +4202,17 @@ void ata_bmdma_setup(struct ata_queued_cmd *qc)
void ata_bmdma_irq_clear(struct ata_port *ap)
{
if (ap->flags & ATA_FLAG_MMIO) {
void __iomem *mmio = ((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
writeb(readb(mmio), mmio);
} else {
unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
outb(inb(addr), addr);
}
if (!ap->ioaddr.bmdma_addr)
return;
if (ap->flags & ATA_FLAG_MMIO) {
void __iomem *mmio =
((void __iomem *) ap->ioaddr.bmdma_addr) + ATA_DMA_STATUS;
writeb(readb(mmio), mmio);
} else {
unsigned long addr = ap->ioaddr.bmdma_addr + ATA_DMA_STATUS;
outb(inb(addr), addr);
}
}