linux-kernel - Re: [PATCH 2/6] ASoC: samsung: smdk_wm8580: Remove old platforms and drop mach-types usage

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Date:   Sat, 19 Nov 2016 16:42:33 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Sangbeom Kim <sbkim73@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 2/6] ASoC: samsung: smdk_wm8580: Remove old platforms and
 drop mach-types usage

On 11/19/2016 03:48 PM, Krzysztof Kozlowski wrote:
[...]
> @@ -206,15 +204,10 @@ static int __init smdk_audio_init(void)
>  	int ret;
>  	char *str;
>  
> -	if (machine_is_smdkc100()
> -			|| machine_is_smdkv210() || machine_is_smdkc110()) {
> -		smdk.num_links = 3;
> -	} else if (machine_is_smdk6410()) {
> -		str = (char *)smdk_dai[PRI_PLAYBACK].cpu_dai_name;
> -		str[strlen(str) - 1] = '2';
> -		str = (char *)smdk_dai[PRI_CAPTURE].cpu_dai_name;
> -		str[strlen(str) - 1] = '2';
> -	}
> +	str = (char *)smdk_dai[PRI_PLAYBACK].cpu_dai_name;
> +	str[strlen(str) - 1] = '2';
> +	str = (char *)smdk_dai[PRI_CAPTURE].cpu_dai_name;
> +	str[strlen(str) - 1] = '2';

This could be further simplified by just updating the initial cpu_dai_name
string in the dai_link struct.

Especially considering that the cpu_dai_name is a string literal and the ARM
kernel now has rodata write protection enabled by default, so modifying it
will crash the kernel.