linux-kernel - Re: [PATCH] Watchdog: sp5100_tco: Lower verbosity of disabled watchdog hardware

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Message-ID: <b394bfcf-9f0d-b27c-5bc0-3d628de98755@roeck-us.net>
Date:   Mon, 9 May 2022 15:55:54 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Mario Limonciello <mario.limonciello@....com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        "open list:WATCHDOG DEVICE DRIVERS" <linux-watchdog@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Cc:     ionut_n2001@...oo.com
Subject: Re: [PATCH] Watchdog: sp5100_tco: Lower verbosity of disabled
 watchdog hardware

On 5/9/22 09:33, Mario Limonciello wrote:
> If watchdog hardware has been disabled, currently the kernel driver
> will show at err level during probe:
> 
> "Watchdog hardware is disabled"
> 
> This is unnecessarily verbose as there is already a -ENODEV returned.
> Lower the level to debug.

Is it ? Without this message, a user may try to load the driver,
get an error message, and have no idea why the driver was not
enabled even though the hardware exists. If anything , -ENODEV
is less than perfect. Unfortunately there does not seem to be
a better error code, or at least I don't see one.

Guenter

> 
> Reported-by: ionut_n2001@...oo.com
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=215762
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   drivers/watchdog/sp5100_tco.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
> index 86ffb58fbc85..e51ecbd5c8b7 100644
> --- a/drivers/watchdog/sp5100_tco.c
> +++ b/drivers/watchdog/sp5100_tco.c
> @@ -286,7 +286,7 @@ static int sp5100_tco_timer_init(struct sp5100_tco *tco)
>   
>   	val = readl(SP5100_WDT_CONTROL(tco->tcobase));
>   	if (val & SP5100_WDT_DISABLED) {
> -		dev_err(dev, "Watchdog hardware is disabled\n");
> +		dev_dbg(dev, "Watchdog hardware is disabled\n");
>   		return -ENODEV;
>   	}
>