linux-kernel - Re: [PATCH] mmc: block: propagate correct returned value in mmc_rpmb

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Date:   Thu, 17 May 2018 10:45:07 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Mathieu Malaterre <malat@...ian.org>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     shawn.lin@...k-chips.com, Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: block: propagate correct returned value in
 mmc_rpmb_ioctl


On 2018/5/17 3:20, Mathieu Malaterre wrote:
> In commit 97548575bef3 ("mmc: block: Convert RPMB to a character device") a
> new function `mmc_rpmb_ioctl` was added. The final return is simply
> returning a value of `0` instead of propagating the correct return code.
> 
> Discovered during a compilation with W=1, silence the following gcc warning
> 
>    drivers/mmc/core/block.c:2470:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
> 

Good catch! But hey, which gcc are you using now? Mine, gcc-linaro-
6.3.1-2017.05-x86_64_aarch64-linux-gnu, with W=1 doesn't warn about
this. And it's worth backporting to stable.

Reviewed-by: Shawn Lin <shawn.lin@...k-chips.com>

> Signed-off-by: Mathieu Malaterre <malat@...ian.org>
> ---
>   drivers/mmc/core/block.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
> index 9e923cd1d80e..38a7586b00cc 100644
> --- a/drivers/mmc/core/block.c
> +++ b/drivers/mmc/core/block.c
> @@ -2485,7 +2485,7 @@ static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
>   		break;
>   	}
>   
> -	return 0;
> +	return ret;
>   }
>   
>   #ifdef CONFIG_COMPAT
>