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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2009-03-19 02:39:31 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-19 08:39:48 +0100 |
| commit | 35d40952dba7b0689a16bd1463fb7698f8dbe639 (patch) | |
| tree | 54020722e333174009f7f588b3960dd32026b03a /lib | |
| parent | dma-debug: fix dma_debug_add_bus() definition for !CONFIG_DMA_API_DEBUG (diff) | |
| download | linux-35d40952dba7b0689a16bd1463fb7698f8dbe639.tar.xz linux-35d40952dba7b0689a16bd1463fb7698f8dbe639.zip | |
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: 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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/dma-debug.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 9a350b414a50..f9e6d38b4b34 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -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); |