linux-kernel - [PATCH 04/12] video: exynos: warnings in exynos_dp

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Date:	Fri, 28 Sep 2012 23:36:09 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, arm@...nel.org,
	Arnd Bergmann <arnd@...db.de>,
	Jingoo Han <jg1.han@...sung.com>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [PATCH 04/12] video: exynos: warnings in exynos_dp_core.c

Something is wrong with the exynos_dp_core logic, and gcc
emits a warning about this. An array is declared in
exynos_dp_process_equalizer_training with length '2',
and exynos_dp_channel_eq_ok tries to access the third
element of it.

This patch is certainly not correct, but hopefully helps
highlight the actual problem. The problem apparently was
introduced by d5c0eed01 "video: exynos_dp: adjust voltage
swing and pre-emphasis during Link Training".

This is what we get in exynos_defconfig:
drivers/video/exynos/exynos_dp_core.c: In function 'exynos_dp_process_equalizer_training':
drivers/video/exynos/exynos_dp_core.c:341:13: warning: array subscript is above array bounds [-Warray-bounds]

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Jingoo Han <jg1.han@...sung.com>
Cc: Florian Tobias Schandinat <FlorianSchandinat@....de>
---
 drivers/video/exynos/exynos_dp_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/exynos/exynos_dp_core.c b/drivers/video/exynos/exynos_dp_core.c
index cdc1398..358b595 100644
--- a/drivers/video/exynos/exynos_dp_core.c
+++ b/drivers/video/exynos/exynos_dp_core.c
@@ -542,7 +542,7 @@ reduce_link_rate:
 
 static int exynos_dp_process_equalizer_training(struct exynos_dp_device *dp)
 {
-	u8 link_status[2];
+	u8 link_status[3];
 	u8 link_align[3];
 	int lane;
 	int lane_count;
-- 
1.7.10

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