linux-kernel - RE: [PATCH v2 04/11] watchdog: rzg2l_wdt: Check return status of pm_runtime

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Message-ID:
 <TYCPR01MB11269AD7463C9C7C0A09A43A9867C2@TYCPR01MB11269.jpnprd01.prod.outlook.com>
Date: Wed, 31 Jan 2024 10:32:37 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Claudiu.Beznea <claudiu.beznea@...on.dev>, "wim@...ux-watchdog.org"
	<wim@...ux-watchdog.org>, "linux@...ck-us.net" <linux@...ck-us.net>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "geert+renesas@...der.be"
	<geert+renesas@...der.be>, "magnus.damm@...il.com" <magnus.damm@...il.com>,
	"mturquette@...libre.com" <mturquette@...libre.com>, "sboyd@...nel.org"
	<sboyd@...nel.org>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>
CC: "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>, Claudiu.Beznea
	<claudiu.beznea@...on.dev>, Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: RE: [PATCH v2 04/11] watchdog: rzg2l_wdt: Check return status of
 pm_runtime_put()

Hi Claudiu,

Thanks for the feedback.

> -----Original Message-----
> From: Claudiu <claudiu.beznea@...on.dev>
> Sent: Wednesday, January 31, 2024 10:20 AM
> Subject: [PATCH v2 04/11] watchdog: rzg2l_wdt: Check return status of
> pm_runtime_put()
> 
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> pm_runtime_put() may return an error code. Check its return status.
> 
> Along with it the rzg2l_wdt_set_timeout() function was updated to
> propagate the result of rzg2l_wdt_stop() to its caller.
> 
> Fixes: 2cbc5cd0b55f ("watchdog: Add Watchdog Timer driver for RZ/G2L")
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
> 
> Changes in v2:
> - propagate the return code of rzg2l_wdt_stop() to it's callers
> 
>  drivers/watchdog/rzg2l_wdt.c | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
> index d87d4f50180c..7bce093316c4 100644
> --- a/drivers/watchdog/rzg2l_wdt.c
> +++ b/drivers/watchdog/rzg2l_wdt.c
> @@ -144,9 +144,13 @@ static int rzg2l_wdt_start(struct watchdog_device
> *wdev)  static int rzg2l_wdt_stop(struct watchdog_device *wdev)  {
>  	struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
> +	int ret;
> 
>  	rzg2l_wdt_reset(priv);
> -	pm_runtime_put(wdev->parent);
> +
> +	ret = pm_runtime_put(wdev->parent);
> +	if (ret < 0)
> +		return ret;

Do we need to check the return code? So far we didn't hit this condition.
If you are planning to do it, then just 

return pm_runtime_put(wdev->parent);

Cheers,
Biju

> 
>  	return 0;


>  }
> @@ -163,7 +167,10 @@ static int rzg2l_wdt_set_timeout(struct
> watchdog_device *wdev, unsigned int time
>  	 * to reset the module) so that it is updated with new timeout
> values.
>  	 */
>  	if (watchdog_active(wdev)) {
> -		rzg2l_wdt_stop(wdev);
> +		ret = rzg2l_wdt_stop(wdev);
> +		if (ret)
> +			return ret;
> +
>  		ret = rzg2l_wdt_start(wdev);
>  	}
> 
> --
> 2.39.2