linux-kernel - Re: [RFC PATCHv3] drivers: power: Detect device suspend/resume lockup and log event in pstore.

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Date:	Thu, 29 Aug 2013 02:49:52 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Colin Cross <ccross@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Cc:	Zoran Markovic <zoran.markovic@...aro.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Benoit Goby <benoit@...roid.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	Todd Poynor <toddpoynor@...gle.com>,
	San Mehat <san@...gle.com>, Pavel Machek <pavel@....cz>,
	Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC PATCHv3] drivers: power: Detect device suspend/resume lockup and log event in pstore.

On Wednesday, August 28, 2013 03:43:42 PM Colin Cross wrote:
> On Wed, Aug 28, 2013 at 3:36 PM, John Stultz <john.stultz@...aro.org> wrote:
> > On 08/28/2013 01:52 PM, Rafael J. Wysocki wrote:
> >> On Wednesday, August 28, 2013 10:45:45 AM Zoran Markovic wrote:
> >>> Hi Rafael,
> >>>> It doesn't look too bad from a quick look, but there's a couple of things
> >>>> I don't like in it still (relatively minor).
> >>> If there are things you would like changed in this patch, please let
> >>> me know. It would be nice to catch the 3.12 merge window.
> >> Well, it's not in my queue to be honest.
> >>
> >> Is there any practical reason why it should go into the next release?
> >
> > I wouldn't say its critical for the next release, but I feel like this
> > was the same response last cycle. Zoran's since investigated the various
> > alternative approaches you've suggested, and continues to be interested
> > in resolving your remaining objections.
> >
> > Its a useful feature the Android devs use, which could also help
> > non-android developers debug suspend issues on their systems.
> >
> > If you really just feel its something best left out of tree, that's hard
> > to argue against. Its just a debug tool and the android guys don't have
> > an issue carrying their own tree, after all. But the cost of leaving it
> > out is just the potential of others having to re-implement similar hacks
> > on their own instead of collaborating on shared infrastructure.

Well, let's just say it had a bad luck timing-wise this time.

It's still there in my todo list and I'll take care of it eventually, but not
today and not tomorrow, which basically is what you're asking for.

> And the benefit is that you are more likely to get bugreports that
> have a stack trace of the offending suspend callback instead of "my
> laptop doesn't suspend any more".

Yes, I understand that.

Thanks,
Rafael

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