linux-kernel - Re: [PATCH 5/10] watchdog: bcm63xx_wdt: Use WATCHDOG

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Date:	Wed, 25 Nov 2015 13:02:10 -0000
From:	"Simon Arlott" <simon@...e.lp0.eu>
To:	"Guenter Roeck" <linux@...ck-us.net>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"Ralf Baechle" <ralf@...ux-mips.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Jason Cooper" <jason@...edaemon.net>,
	"Marc Zyngier" <marc.zyngier@....com>,
	"Kevin Cernekee" <cernekee@...il.com>,
	"Florian Fainelli" <f.fainelli@...il.com>,
	"Wim Van Sebroeck" <wim@...ana.be>,
	"Maxime Bizon" <mbizon@...ebox.fr>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-mips@...ux-mips.org, linux-watchdog@...r.kernel.org,
	"Rob Herring" <robh+dt@...nel.org>,
	"Pawel Moll" <pawel.moll@....com>,
	"Mark Rutland" <mark.rutland@....com>,
	"Ian Campbell" <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	"Jonas Gorski" <jogo@...nwrt.org>
Subject: Re: [PATCH 5/10] watchdog: bcm63xx_wdt: Use WATCHDOG_CORE

On Wed, November 25, 2015 02:44, Guenter Roeck wrote:
> The "running" flag should no longer be needed. watchdog_active()
> should provide that information.

I'm going to need to keep that because I need to know if it's running
in the interrupt handler, and wdd->lock is a mutex.

>> @@ -306,17 +202,18 @@ unregister_timer:
>>
>>   static int bcm63xx_wdt_remove(struct platform_device *pdev)
>>   {
>> -	if (!nowayout)
>> -		bcm63xx_wdt_hw_stop();
>> +	struct watchdog_device *wdd = platform_get_drvdata(pdev);
>>
>> -	misc_deregister(&bcm63xx_wdt_miscdev);
>>   	bcm63xx_timer_unregister(TIMER_WDT_ID);
>> +	watchdog_unregister_device(wdd);
>
> Shouldn't that come first, before unregistering the timer ?

No, because wdd->dev is used in the interrupt handler. I will have to
move registration of the interrupt to after creating the watchdog
because it could currently be used before wdd->dev is set.

-- 
Simon Arlott
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