From fe73fbe1c5eda709084dedb66cbdd4b86826cce7 Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@canonical.com>
Date: Fri, 19 Oct 2012 13:57:01 -0700
Subject: [PATCH] lib/dma-debug.c: fix __hash_bucket_find()
If there is only one match, the unique matched entry should be returned.
Without the fix, the upcoming dma debug interfaces ("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().
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reported-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>
Tested-by: Shuah Khan <shuah.khan@hp.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
lib/dma-debug.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index b9087bff008be..d84beb994f36f 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -264,7 +264,7 @@ static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
match_fn match)
{
struct dma_debug_entry *entry, *ret = NULL;
- int matches = 0, match_lvl, last_lvl = 0;
+ int matches = 0, match_lvl, last_lvl = -1;
list_for_each_entry(entry, &bucket->list, list) {
if (!match(ref, entry))
@@ -293,7 +293,7 @@ static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
} else if (match_lvl > last_lvl) {
/*
* We found an entry that fits better then the
- * previous one
+ * previous one or it is the 1st match.
*/
last_lvl = match_lvl;
ret = entry;
--
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