linux-kernel - Re: watchdog: deadlock warning with imx2

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Message-ID: <20160421134444.GA1515@archie.localdomain>
Date:	Thu, 21 Apr 2016 15:44:45 +0200
From:	Clemens Gruber <clemens.gruber@...ruber.com>
To:	Guenter Roeck <linux@...ck-us.net>, linux-watchdog@...r.kernel.org
Cc:	Wim Van Sebroeck <wim@...ana.be>, linux-kernel@...r.kernel.org
Subject: Re: watchdog: deadlock warning with imx2_wdt driver and systemd

On Wed, Apr 20, 2016 at 09:30:07PM -0700, Guenter Roeck wrote:
> 
> Hi Clemens,
> 
> fix is to drop the call to cancel_delayed_work_sync() from watchdog_release().
> Turns out the call is not necessary.
> 
> I'll send a proper patch in the next couple of days.
> 
> Guenter
> 

Hi Guenter,

thank you for finding the cause of the problem! Removing the
cancel_delayed_work_sync call from watchdog_release in watchdog_dev.c
did fix the lockdep warning on all my boards [without having to revert
commit 11d7aba9ce (watchdog: imx2: Convert to use infrastructure
triggered keepalives) first].

Tested-by: Clemens Gruber <clemens.gruber@...ruber.com>

Cheers,
Clemens