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dma-debug: warn of unmapping an invalid dma address

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Impact: extend DMA-debug checks

Calling dma_unmap families against an invalid dma address should be a
bug.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Joerg Roedel <joerg.roedel@amd.com>
LKML-Reference: <20090319103743N.fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori 2009-03-19 10:39:31 +09:00 committed by Ingo Molnar
parent 84be58d460
commit 35d40952db
1 changed files with 4 additions and 1 deletions
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5
lib/dma-debug.c
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@ -531,8 +531,11 @@ static void check_unmap(struct dma_debug_entry *ref)
struct hash_bucket *bucket;
unsigned long flags;
if (dma_mapping_error(ref->dev, ref->dev_addr))
if (dma_mapping_error(ref->dev, ref->dev_addr)) {
err_printk(ref->dev, NULL, "DMA-API: device driver tries "
"to free an invalid DMA memory address\n");
return;
}
bucket = get_hash_bucket(ref, &flags);
entry = hash_bucket_find(bucket, ref);