diff options
| -rw-r--r-- | drivers/scsi/libata-core.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c index 673ddf611d0e..c8d2201b126f 100644 --- a/drivers/scsi/libata-core.c +++ b/drivers/scsi/libata-core.c @@ -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); + } } |