linux-kernel - Re: [PATCH 11/11] ASoC: wm8994: Mark expected switch fall-through

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Message-ID: <30613.1533313609@turing-police.cc.vt.edu>
Date:   Fri, 03 Aug 2018 12:26:49 -0400
From:   valdis.kletnieks@...edu
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        patches@...nsource.cirrus.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 11/11] ASoC: wm8994: Mark expected switch fall-through

On Wed, 01 Aug 2018 14:56:16 -0500, "Gustavo A. R. Silva" said:

> diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
> index 7fdfdf3..62f8c5b 100644
> --- a/sound/soc/codecs/wm8994.c
> +++ b/sound/soc/codecs/wm8994.c
> @@ -2432,6 +2432,7 @@ static int wm8994_set_dai_sysclk(struct snd_soc_dai *dai,
>  			snd_soc_component_update_bits(component, WM8994_POWER_MANAGEMENT_2,
>  					    WM8994_OPCLK_ENA, 0);
>  		}
> +		/* fall through */
>
>  	default:
>  		return -EINVAL;

Wait, what? This looks like the sort of bug -Wimplicit-fallthrough is supposed
to catch.  Unless for 'case WM8994_SYSCLK_OPCLK:' we actually do want to do a
whole bunch of snd_soc_component_update_bits() calls and then return -EINVAL
whether or not that case succeeded?



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