linux-kernel - Re: [PATCH] scsi: mpt3sas: Mark expected switch fall-through

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Date:   Tue, 11 Jun 2019 11:55:11 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Sathya Prakash <sathya.prakash@...adcom.com>,
        Chaitra P B <chaitra.basappa@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: mpt3sas: Mark expected switch fall-through

On Tue, Jun 11, 2019 at 10:02:19AM -0500, 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 warning:
> 
> drivers/scsi/mpt3sas/mpt3sas_base.c: In function ‘_base_update_ioc_page1_inlinewith_perf_mode’:
> drivers/scsi/mpt3sas/mpt3sas_base.c:4510:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    if (ioc->high_iops_queues) {
>       ^
> drivers/scsi/mpt3sas/mpt3sas_base.c:4530:2: note: here
>   case MPT_PERF_MODE_LATENCY:
>   ^~~~
> 
> 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>

Fixes: 30cb97023f38 ("scsi: mpt3sas: Introduce perf_mode module parameter")
Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  drivers/scsi/mpt3sas/mpt3sas_base.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
> index e6377ec07f6c..9fefcd1e9c97 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
> @@ -4527,6 +4527,7 @@ _base_update_ioc_page1_inlinewith_perf_mode(struct MPT3SAS_ADAPTER *ioc)
>  			ioc_info(ioc, "performance mode: balanced\n");
>  			return;
>  		}
> +		/* Fall through */
>  	case MPT_PERF_MODE_LATENCY:
>  		/*
>  		 * Enable interrupt coalescing on all reply queues
> -- 
> 2.21.0
> 

-- 
Kees Cook