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authorJeff Garzik <jeff@garzik.org>2006-03-21 21:31:22 -0500
committerJeff Garzik <jeff@garzik.org>2006-03-21 21:31:22 -0500
commit4d4681f6b994baf93dff0e4f59ab4fe38b49ef13 (patch)
treeb45ce12c0b6a4561ccba3f6327d98aa5af864c2a /drivers
parent17bb34a3c548c4fd2a7c859123a631f97c2af09f (diff)
[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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/libata-core.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 673ddf611d0..c8d2201b126 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);
+ }
}