linux-hardening - Re: [PATCH][next] ASoC: ti: davinci-mcasp: Fix fall-through warning for Clang

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Date:   Fri, 4 Jun 2021 02:29:13 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Péter Ujfalusi <peter.ujfalusi@...il.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] ASoC: ti: davinci-mcasp: Fix fall-through warning
 for Clang



On 6/4/21 02:14, Péter Ujfalusi wrote:
> 
> 
> On 28/05/2021 23:20, Gustavo A. R. Silva wrote:
>> In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
>> by explicitly adding a goto statement instead of letting the code fall
>> through to the next case.
>>
>> Link: https://github.com/KSPP/linux/issues/115
>> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
>> ---
>> JFYI: We had thousands of these sorts of warnings and now we are down
>>       to just 25 in linux-next. This is one of those last remaining
>>       warnings.
>>
>>  sound/soc/ti/davinci-mcasp.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/sound/soc/ti/davinci-mcasp.c b/sound/soc/ti/davinci-mcasp.c
>> index b94220306d1a..587967720135 100644
>> --- a/sound/soc/ti/davinci-mcasp.c
>> +++ b/sound/soc/ti/davinci-mcasp.c
>> @@ -2317,6 +2317,7 @@ static int davinci_mcasp_probe(struct platform_device *pdev)
>>  		break;
>>  	default:
>>  		dev_err(&pdev->dev, "No DMA controller found (%d)\n", ret);
>> +		goto err;
> 
> Would:
> 	fallthrough;
> 
> be enough to silence the warning? If so, then I would prefer this version.

Yep.:) Done:

	https://lore.kernel.org/linux-hardening/20210604072714.GA244640@embeddedor/

Thanks
--
Gustavo