linux-kernel - [PATCH] lib/dma-debug.c: fix __hash_bucket

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Message-Id: <1350574699-6419-1-git-send-email-ming.lei@canonical.com>
Date:	Thu, 18 Oct 2012 23:38:19 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	linux-kernel@...r.kernel.org
Cc:	Ming Lei <ming.lei@...onical.com>,
	Joerg Roedel <joerg.roedel@....com>,
	Shuah Khan <shuah.khan@...com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jakub Kicinski <kubakici@...pl>
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 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 <joerg.roedel@....com>
Cc: Shuah Khan <shuah.khan@...com>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jakub Kicinski <kubakici@...pl>
Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 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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