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

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Message-id: <002001cda2cf$b0b69c60$1223d520$%han@samsung.com>
Date:	Fri, 05 Oct 2012 17:01:56 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Arnd Bergmann' <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arm@...nel.org,
	'Florian Tobias Schandinat' <FlorianSchandinat@....de>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH 04/12] video: exynos: warnings in exynos_dp_core.c

On Saturday, September 29, 2012 6:36 AM Arnd Bergmann wrote
> 
> 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]

Hi Arnd Bergmann,

This problem was fixed. So, this patch is not necessary.

As you mentioned, this problem was introduced by d5c0eed01
"video: exynos_dp: adjust voltage swing and pre-emphasis
during Link Training".

However, this problem was resolved by e75478b "video: exynos_dp:
replace link_status with link_align to check channel equalization".

The patch was merged to 'fbdev-next', and will be merged to
'3.7-rc1', soon. Thank you.

Best regards,
Jingoo Han


> 
> 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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