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-rw-r--r--lib/dma-debug.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 9a350b4..f9e6d38 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);
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