linux-kernel - Re: [PATCH v2] watchdog: at91sam9_wdt: use devm_request_irq to avoid missing free

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Date:   Wed, 16 Nov 2022 05:55:00 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     ruanjinjie <ruanjinjie@...wei.com>
Cc:     wim@...ux-watchdog.org, nicolas.ferre@...rochip.com,
        alexandre.belloni@...tlin.com, claudiu.beznea@...rochip.com,
        bbrezillon@...nel.org, linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] watchdog: at91sam9_wdt: use devm_request_irq to avoid
 missing free_irq() in error path

On Wed, Nov 16, 2022 at 05:49:50PM +0800, ruanjinjie wrote:
> free_irq() is missing in case of error in at91_wdt_init(), use
> devm_request_irq to fix that.
> 
> Fixes: 5161b31dc39a ("watchdog: at91sam9_wdt: better watchdog support")
> Signed-off-by: ruanjinjie <ruanjinjie@...wei.com>

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


> ---
>  drivers/watchdog/at91sam9_wdt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
> index 292b5a1ca831..b9e8572c707d 100644
> --- a/drivers/watchdog/at91sam9_wdt.c
> +++ b/drivers/watchdog/at91sam9_wdt.c
> @@ -206,7 +206,7 @@ static int at91_wdt_init(struct platform_device *pdev, struct at91wdt *wdt)
>  			 "min heartbeat and max heartbeat might be too close for the system to handle it correctly\n");
>  
>  	if ((tmp & AT91_WDT_WDFIEN) && wdt->irq) {
> -		err = request_irq(wdt->irq, wdt_interrupt,
> +		err = devm_request_irq(dev, wdt->irq, wdt_interrupt,
>  				  IRQF_SHARED | IRQF_IRQPOLL |
>  				  IRQF_NO_SUSPEND,
>  				  pdev->name, wdt);
> -- 
> 2.25.1
>