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lib/swiotlb.c: Fix strange panic message selection logic when swiotlb fills up

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swiotlb_full() in lib/swiotlb.c throws one of two panic messages
based on whether the direction of transfer is from the device
or to the device. The logic around this is somewhat weird in
the case of bidirectional transfers. It appears to want to
throw both in succession, but since its a panic only the first
makes it.

This patch adds a third, separate error for DMA_BIDIRECTIONAL
to make things a bit clearer.

Signed-off-by: Casey Dahlin <[email protected]>
Cc: FUJITA Tomonori <[email protected]>
Cc: Becky Bruce <[email protected]>
[ further fixed the error message ]
Signed-off-by: Andrew Morton <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Casey Dahlin 2009-08-20 16:27:56 -07:00 • committed by Ingo Molnar
commit c7084b35eb
1 changed files with 9 additions and 6 deletions
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15
lib/swiotlb.c
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@ -581,12 +581,15 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at "
"device %s\n", size, dev ? dev_name(dev) : "?");
if (size > io_tlb_overflow && do_panic) {
if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
panic("DMA: Memory would be corrupted\n");
if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)
panic("DMA: Random memory would be DMAed\n");
}
if (size <= io_tlb_overflow || !do_panic)
return;
if (dir == DMA_BIDIRECTIONAL)
panic("DMA: Random memory could be DMA accessed\n");
if (dir == DMA_FROM_DEVICE)
panic("DMA: Random memory could be DMA written\n");
if (dir == DMA_TO_DEVICE)
panic("DMA: Random memory could be DMA read\n");
}
/*