linux-kernel - Re: [PATCH v2] mmc: sdhci-cadence: fix logically and structurally dead code

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Date:   Fri, 20 Apr 2018 09:08:49 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mmc: sdhci-cadence: fix logically and structurally
 dead code

On 19/04/18 18:59, Gustavo A. R. Silva wrote:
> Currently, the code block inside the for loop will never execute
> more than once, because the function returns inmediately after
> the first iteration, hence the execution of the code at the second
> iteration is structurally dead and, code at line 281: return 0; is
> never reached.
> 
> Fix this by checking _ret_ before return.
> 
> Addresses-Coverity-ID: 1468009 ("Logically dead code")
> Addresses-Coverity-ID: 1468002 ("Structurally dead code")
> Suggested-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> Changes in v2:
>  - Update changelog.
>  - Drop the 'Fixes' tag.
>  - Add check on ret instead of removing the "return ret;" line.
>  - Thanks to Masahiro Yamada for the feedback provided.
> 
>  drivers/mmc/host/sdhci-cadence.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
> index bc30d16..7a343b8 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -274,8 +274,8 @@ static int sdhci_cdns_set_tune_val(struct sdhci_host *host, unsigned int val)
>  		ret = readl_poll_timeout(reg, tmp,
>  					 !(tmp & SDHCI_CDNS_HRS06_TUNE_UP),
>  					 0, 1);
> -
> -		return ret;
> +		if (ret)
> +			return ret;
>  	}
>  
>  	return 0;
>