linux-kernel - Re: [PATCH 1/2] PM / wakeup: Remove timer from wakeup_source

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Message-ID: <20190312090430.GA28905@amd>
Date:   Tue, 12 Mar 2019 10:04:30 +0100
From:   Pavel Machek <pavel@....cz>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>,
        sunzhaosheng@...ilicon.com, jean.xupeng@...ilicon.com,
        yuwei3@...ilicon.com, gengyanping@...ilicon.com,
        peter.panshilin@...ilicon.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] PM / wakeup: Remove timer from wakeup_source_remove()

On Tue 2019-03-12 08:58:02, Viresh Kumar wrote:
> On 11-03-19, 13:05, Rafael J. Wysocki wrote:
> > On Friday, March 8, 2019 10:53:11 AM CET Viresh Kumar wrote:
> > > wakeup_source_remove() is the counterpart of wakeup_source_add() helper
> > > and must undo the initializations done by wakeup_source_add(). Currently
> > > the timer is initialized by wakeup_source_add() but removed from
> > > wakeup_source_drop(), which doesn't look logically correct. Also it
> > > should be okay to call wakeup_source_add() right after calling
> > > wakeup_source_remove(), and in that case we may end up calling
> > > timer_setup() for a potentially scheduled timer which is surely
> > > incorrect.
> > > 
> > > Move the timer removal part to wakeup_source_remove() instead.

> > 
> > I've merged it with the [2/2], rewritten the subject and changelog and
> > queued the result as commit d856f39ac1cc ("PM / wakeup: Rework wakeup
> > source timer cancellation").
> 
> Okay, thanks. We (Android guys) want this to be backported into 4.4+
> kernels via the stable tree. Can we mark this for stable in the commit
> itself ? Else I would be required to send this separately for all the
> kernels. I should have marked it for stable initially though, sorry
> about forgetting then.

Greg is normally pretty agressive about backporting everything
remotely looking like a fix...

But better changelog would help. How is the bug actually affecting
users?

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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