linux-kernel - Re: [PATCH v3] watchdog: sbsa_wdog: Make sure the timeout programming is within the limits

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Date:   Wed, 8 Feb 2023 19:33:28 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     George Cherian <george.cherian@...vell.com>,
        wim@...ux-watchdog.org, zhangshaokun@...ilicon.com
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] watchdog: sbsa_wdog: Make sure the timeout programming
 is within the limits

On 2/8/23 18:11, George Cherian wrote:
> Make sure to honour the max_hw_heartbeat_ms while programming the timeout
> value to WOR. Clamp the timeout passed to sbsa_gwdt_set_timeout() to
> make sure the programmed value is within the permissible range.
> 
> Fixes: abd3ac7902fb ("watchdog: sbsa: Support architecture version 1")
> 
> Signed-off-by: George Cherian <george.cherian@...vell.com>

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

> ---
>   drivers/watchdog/sbsa_gwdt.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/watchdog/sbsa_gwdt.c b/drivers/watchdog/sbsa_gwdt.c
> index 9791c74aebd4..63862803421f 100644
> --- a/drivers/watchdog/sbsa_gwdt.c
> +++ b/drivers/watchdog/sbsa_gwdt.c
> @@ -150,6 +150,7 @@ static int sbsa_gwdt_set_timeout(struct watchdog_device *wdd,
>   	struct sbsa_gwdt *gwdt = watchdog_get_drvdata(wdd);
>   
>   	wdd->timeout = timeout;
> +	timeout = clamp_t(unsigned int, timeout, 1, wdd->max_hw_heartbeat_ms / 1000);
>   
>   	if (action)
>   		sbsa_gwdt_reg_write(gwdt->clk * timeout, gwdt);