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[PATCH] x86_64: Don't warn for overflow in nommu case when dma_mask is < 32bit

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This triggers for b44's 1GB DMA workaround which tries to map
first and then bounces.

The 32bit heuristic is reasonable because the IOMMU doesn't attempt
to handle < 32bit masks anyways.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-05-15 18:19:38 +02:00 committed by Linus Torvalds
parent 639b421b91
commit f0fdabf8bf
1 changed files with 4 additions and 3 deletions
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7
arch/x86_64/kernel/pci-nommu.c
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@ -12,9 +12,10 @@ static int
check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size) check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
{ {
if (hwdev && bus + size > *hwdev->dma_mask) { if (hwdev && bus + size > *hwdev->dma_mask) {
printk(KERN_ERR if (*hwdev->dma_mask >= 0xffffffffULL)
"nommu_%s: overflow %Lx+%lu of device mask %Lx\n", printk(KERN_ERR
name, (long long)bus, size, (long long)*hwdev->dma_mask); "nommu_%s: overflow %Lx+%lu of device mask %Lx\n",
name, (long long)bus, size, (long long)*hwdev->dma_mask);
return 0; return 0;
} }
return 1; return 1;