Commit 35d40952 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Ingo Molnar
Browse files

dma-debug: warn of unmapping an invalid dma address


Impact: extend DMA-debug checks

Calling dma_unmap families against an invalid dma address should be a
bug.
Signed-off-by: default avatarFUJITA 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: default avatarIngo Molnar <mingo@elte.hu>
parent 84be58d4
Showing with 4 additions and 1 deletion
+4 -1
......@@ -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);
......
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