linux-kernel - RE: [PATCH 07/10] watchdog: keembay: Update the check in keembay_wdt

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Date:   Thu, 13 May 2021 05:32:00 +0000
From:   "Sanil, Shruthi" <shruthi.sanil@...el.com>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "kris.pan@...ux.intel.com" <kris.pan@...ux.intel.com>,
        "mgross@...ux.intel.com" <mgross@...ux.intel.com>,
        "Thokala, Srikanth" <srikanth.thokala@...el.com>,
        "Raja Subramanian, Lakshmi Bai" 
        <lakshmi.bai.raja.subramanian@...el.com>,
        "Sangannavar, Mallikarjunappa" 
        <mallikarjunappa.sangannavar@...el.com>
Subject: RE: [PATCH 07/10] watchdog: keembay: Update the check in
 keembay_wdt_resume()

> -----Original Message-----
> From: Guenter Roeck <groeck7@...il.com> On Behalf Of Guenter Roeck
> Sent: Wednesday, May 12, 2021 7:32 PM
> To: Sanil, Shruthi <shruthi.sanil@...el.com>
> Cc: wim@...ux-watchdog.org; linux-watchdog@...r.kernel.org; linux-
> kernel@...r.kernel.org; andriy.shevchenko@...ux.intel.com;
> kris.pan@...ux.intel.com; mgross@...ux.intel.com; Thokala, Srikanth
> <srikanth.thokala@...el.com>; Raja Subramanian, Lakshmi Bai
> <lakshmi.bai.raja.subramanian@...el.com>; Sangannavar, Mallikarjunappa
> <mallikarjunappa.sangannavar@...el.com>
> Subject: Re: [PATCH 07/10] watchdog: keembay: Update the check in
> keembay_wdt_resume()
> 
> On Wed, May 12, 2021 at 02:17:21PM +0530, shruthi.sanil@...el.com wrote:
> > From: Shruthi Sanil <shruthi.sanil@...el.com>
> >
> > Corrected the typo in the function keembay_wdt_resume, we need to
> > enable the WDT if it is disabled/not active.
> >
> > Fixes: fa0f8d51e90d ("watchdog: Add watchdog driver for Intel Keembay
> > Soc")
> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Tested-by: Kris Pan <kris.pan@...el.com>
> > Signed-off-by: Shruthi Sanil <shruthi.sanil@...el.com>
> > ---
> >  drivers/watchdog/keembay_wdt.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/watchdog/keembay_wdt.c
> > b/drivers/watchdog/keembay_wdt.c index dd192b8dff55..10896415f8c7
> > 100644
> > --- a/drivers/watchdog/keembay_wdt.c
> > +++ b/drivers/watchdog/keembay_wdt.c
> > @@ -260,7 +260,7 @@ static int __maybe_unused
> > keembay_wdt_resume(struct device *dev)  {
> >  	struct keembay_wdt *wdt = dev_get_drvdata(dev);
> >
> > -	if (watchdog_active(&wdt->wdd))
> > +	if (!watchdog_active(&wdt->wdd))
> 
> Have you tested this ? "watchdog_active" refers to the watchdog core state.
> Your code now keeps the watchdog stopped after resume if it was running
> before, and starts it if it wasn't. Please run through a suspend/resume cycle
> with watchdog disabled and see what happens.
> 
> Guenter

I had understood it wrongly. I was assuming that watchdog_active refers to the actual state of the HW. Hence I made that change.
But since watchdog_active refers to the state of the core, the change that I have done is incorrect. Hence I'll drop this patch.

Thanks
Shruthi

> 
> >  		return keembay_wdt_start(&wdt->wdd);
> >
> >  	return 0;
> > --
> > 2.17.1
> >