linux-kernel - Re: [PATCH] ASoC: samsung: add missing "fallthrough;"

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Date:   Mon, 27 Sep 2021 11:56:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: samsung: add missing "fallthrough;"

On 27/09/2021 11:54, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> With gcc, we get a warning in this file:
> 
> In file included from include/linux/io.h:13,
>                  from sound/soc/samsung/s3c-i2s-v2.c:16:
> sound/soc/samsung/s3c-i2s-v2.c: In function 's3c2412_i2s_trigger':
> arch/arm/include/asm/io.h:92:22: error: this statement may fall through [-Werror=implicit-fallthrough=]
>  #define __raw_writel __raw_writel
>                       ^
> arch/arm/include/asm/io.h:299:29: note: in expansion of macro '__raw_writel'
>  #define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c)
>                              ^~~~~~~~~~~~
> arch/arm/include/asm/io.h:307:36: note: in expansion of macro 'writel_relaxed'
>  #define writel(v,c)  ({ __iowmb(); writel_relaxed(v,c); })
>                                     ^~~~~~~~~~~~~~
> sound/soc/samsung/s3c-i2s-v2.c:398:3: note: in expansion of macro 'writel'
>    writel(0x0, i2s->regs + S3C2412_IISFIC);
>    ^~~~~~
> sound/soc/samsung/s3c-i2s-v2.c:400:2: note: here
>   case SNDRV_PCM_TRIGGER_RESUME:
>   ^~~~
> 
> From all I can tell, this was indeed meant to fall through, so
> add "fallthrough;" statement to avoid the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  sound/soc/samsung/s3c-i2s-v2.c | 2 ++
>  1 file changed, 2 insertions(+)
> 


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>


Best regards,
Krzysztof