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

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Message-ID:
 <TYCPR01MB11269BFC2DB457049A2B8C0C8867C2@TYCPR01MB11269.jpnprd01.prod.outlook.com>
Date: Wed, 31 Jan 2024 10:41:43 +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.uj@...renesas.com>
Subject: RE: [PATCH v2 04/11] watchdog: rzg2l_wdt: Check return status of
 pm_runtime_put()

Hi Claudiu,

> -----Original Message-----
> From: claudiu beznea <claudiu.beznea@...on.dev>
> Sent: Wednesday, January 31, 2024 10:36 AM
> Subject: Re: [PATCH v2 04/11] watchdog: rzg2l_wdt: Check return status of
> pm_runtime_put()
> 
> Hi, Biju,
> 
> On 31.01.2024 12:32, Biju Das wrote:
> > 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);
> 
> pm_runtime_put() may return 1 if the device is suspended (which is not
> considered error) as explained here:

Oops, I missed that discussion. Out of curiosity,
What watchdog framework/consumer is going to do with a 
Non-error return value of 1?

Cheers,
Biju