linux-kernel - Re: [PATCH] watchdog: ts72xx_wdt: constify watchdog

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Message-ID: <ef62d519-2b18-816a-5253-89f5fc276332@roeck-us.net>
Date:   Fri, 7 Jul 2017 18:44:30 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Wim Van Sebroeck <wim@...ana.be>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: ts72xx_wdt: constify watchdog_ops structure

On 07/07/2017 05:18 PM, Gustavo A. R. Silva wrote:
> Check for watchdog_ops structures that are only stored in the ops field of
> a watchdog_device structure. This field is declared const, so watchdog_ops
> structures that have this property can be declared as const also.
> 
> This issue was detected using Coccinelle and the following semantic patch:
> 
> @r
> disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct watchdog_ops i@p = { ... };
> 
> @ok@
> identifier r.i;
> struct watchdog_device e;
> position p;
> @@
> e.ops = &i@p;
> 
> @bad@
> position p != {r.p,ok.p};
> identifier r.i;
> struct watchdog_ops e;
> @@
> e@i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r.i;
> @@
> static
> +const
>   struct watchdog_ops i = { ... };
> 
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/ts72xx_wdt.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/ts72xx_wdt.c b/drivers/watchdog/ts72xx_wdt.c
> index 17c25da..811e43c 100644
> --- a/drivers/watchdog/ts72xx_wdt.c
> +++ b/drivers/watchdog/ts72xx_wdt.c
> @@ -112,7 +112,7 @@ static const struct watchdog_info ts72xx_wdt_ident = {
>   	.identity		= "TS-72XX WDT",
>   };
>   
> -static struct watchdog_ops ts72xx_wdt_ops = {
> +static const struct watchdog_ops ts72xx_wdt_ops = {
>   	.owner		= THIS_MODULE,
>   	.start		= ts72xx_wdt_start,
>   	.stop		= ts72xx_wdt_stop,
>