linux-kernel - Re: [PATCH] mmc: atmel-mci: Mark expected switch fall-throughs

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Message-ID: <20190801071136.37yjjr3kmdhfyxna@M43218.corp.atmel.com>
Date:   Thu, 1 Aug 2019 09:11:36 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Kees Cook <keescook@...omium.org>
CC:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <linux-mmc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] mmc: atmel-mci: Mark expected switch fall-throughs

On Wed, Jul 31, 2019 at 09:06:07AM -0700, Kees Cook wrote:
> On Wed, Jul 31, 2019 at 01:32:16PM +0200, Ludovic Desroches wrote:
> > > drivers/mmc/host/atmel-mci.c:2426:40: warning: this statement may fall through [-Wimplicit-fallthrough=]
> > >    host->caps.need_notbusy_for_read_ops = 1;
> > >    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
> > > drivers/mmc/host/atmel-mci.c:2427:2: note: here
> > >   case 0x100:
> > >   ^~~~
> > > 
> > > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > > Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> > 
> > I don't know if there is a policy in the kernel about the expression to
> > use. As this one does the job
> 
> Yup, documented here:
> https://www.kernel.org/doc/html/latest/process/deprecated.html#implicit-switch-case-fall-through

Thanks for the pointer.

Regards

Ludovic

> 
> > Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
> 
> Thanks!
> 
> -- 
> Kees Cook