linux-kernel - Re: [PATCH] iio: chemical: sps30: mark expected switch fall-throughs

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Message-ID: <20190213191142.GA23470@arch>
Date:   Wed, 13 Feb 2019 20:11:43 +0100
From:   Tomasz Duszynski <tduszyns@...il.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] iio: chemical: sps30: mark expected switch fall-throughs

On Tue, Feb 12, 2019 at 08:48:42PM -0600, Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
>
> This patch fixes the following warnings:
>

That have been already fixed by this commit available at Greg's staging tree:

59b9bb0 iio:chemical:sps30 Suppress some switch fallthrough warnings.


> drivers/iio/chemical/sps30.c: In function ‘sps30_read_raw’:
> drivers/iio/chemical/sps30.c:289:4: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     switch (chan->channel2) {
>     ^~~~~~
> drivers/iio/chemical/sps30.c:299:3: note: here
>    default:
>    ^~~~~~~
> drivers/iio/chemical/sps30.c: In function ‘sps30_do_cmd’:
> drivers/iio/chemical/sps30.c:120:10: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    buf[1] = (u8)SPS30_AUTO_CLEANING_PERIOD;
>           ^
> drivers/iio/chemical/sps30.c:121:2: note: here
>   case SPS30_READ_DATA_READY_FLAG:
>   ^~~~
> drivers/gpio/gpio-eic-sprd.c: In function ‘sprd_eic_irq_set_type’:
> drivers/gpio/gpio-eic-sprd.c:403:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    switch (flow_type) {
>    ^~~~~~
> drivers/gpio/gpio-eic-sprd.c:435:2: note: here
>   default:
>   ^~~~~~~
>
> Warning level 3 was used: -Wimplicit-fallthrough=3
>
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/iio/chemical/sps30.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c
> index e03a28a67146..f308d8ddceec 100644
> --- a/drivers/iio/chemical/sps30.c
> +++ b/drivers/iio/chemical/sps30.c
> @@ -118,6 +118,7 @@ static int sps30_do_cmd(struct sps30_state *state, u16 cmd, u8 *data, int size)
>  	case SPS30_READ_AUTO_CLEANING_PERIOD:
>  		buf[0] = SPS30_AUTO_CLEANING_PERIOD >> 8;
>  		buf[1] = (u8)SPS30_AUTO_CLEANING_PERIOD;
> +		/* fall through */
>  	case SPS30_READ_DATA_READY_FLAG:
>  	case SPS30_READ_DATA:
>  	case SPS30_READ_SERIAL:
> @@ -296,6 +297,7 @@ static int sps30_read_raw(struct iio_dev *indio_dev,
>
>  				return IIO_VAL_INT_PLUS_MICRO;
>  			}
> +			/* fall through */
>  		default:
>  			return -EINVAL;
>  		}
> --
> 2.20.1
>