Re: [PATCH] watchdog: stm32_iwdg: constify watchdog_ops structure

[Guenter Roeck]

On 07/07/2017 05:28 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@xxxxxxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

> ---
>   drivers/watchdog/stm32_iwdg.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c
> index 6c501b7..be64a86 100644
> --- a/drivers/watchdog/stm32_iwdg.c
> +++ b/drivers/watchdog/stm32_iwdg.c
> @@ -140,7 +140,7 @@ static const struct watchdog_info stm32_iwdg_info = {
>   	.identity	= "STM32 Independent Watchdog",
>   };
>   
> -static struct watchdog_ops stm32_iwdg_ops = {
> +static const struct watchdog_ops stm32_iwdg_ops = {
>   	.owner		= THIS_MODULE,
>   	.start		= stm32_iwdg_start,
>   	.ping		= stm32_iwdg_ping,