If there is only one match, the unique matched entry should be returned.
Without the fix, the commit f62566214fe31c9f9b3218a42f1b19e6a9e6844a
dma-debug: new interfaces to debug dma mapping errors
can't work reliably because only device and dma_addr are passed to
dma_mapping_error().
Cc: Joerg Roedel <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
---
lib/dma-debug.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 94aa94e..be132f3 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -283,6 +283,10 @@ static struct dma_debug_entry *__hash_bucket_find(struct
hash_bucket *bucket,
if (!match(ref, entry))
continue;
+ /* record the first match */
+ if (!ret)
+ ret = entry;
+
/*
* Some drivers map the same physical address multiple
* times. Without a hardware IOMMU this results in the
--
1.7.9.5
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