linux-kernel - Re: Possible suspend/resume regression in .32-rc?

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Date:	Mon, 2 Nov 2009 11:51:41 +0100
From:	Pavel Machek <pavel@....cz>
To:	Haojian Zhuang <haojian.zhuang@...il.com>
Cc:	dsaxena@...top.org, alan@...ux.intel.com, gregkh@...e.de,
	Daniel Mack <daniel@...aq.de>,
	linux-arm-kernel@...ts.infradead.org, Eric <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...vell.com>, rpurdie@...ys.net,
	lenz@...wisc.edu, kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, arminlitzel@....de,
	Cyril Hrubis <metan@....cz>, thommycheck@...il.com,
	dbaryshkov@...il.com, omegamoon@...il.com, utx@...guin.cz,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Possible suspend/resume regression in .32-rc?

On Mon 2009-11-02 06:48:28, Haojian Zhuang wrote:
> On Mon, Nov 2, 2009 at 5:38 AM, Pavel Machek <pavel@....cz> wrote:
> > On Mon 2009-11-02 05:22:30, Haojian Zhuang wrote:
> >> On Sun, Nov 1, 2009 at 6:03 PM, Pavel Machek <pavel@....cz> wrote:
> >>
> >> Em, it's not caused by the IRQ patch.
> >>
> >> The kernel is blocked in resume path. When console is resumed, IRQ is
> >> already disabled and system is blocked. Actually, IRQ shouldn't be
> >> disabled at here. Up to now, I only find which patch will cause this
> >> issue. But I can't find the best solution on it. The patch with issue
> >> is pasted in below.
> >>
> >> So this issue is only occused when console suspend is enabled. If you
> >> enable no_console_suspend in command, you won't meet this issue. It
> >> seems that it's caused by removing termios setting in
> >> uart_resume_port() in the below patch. If I add these code back, the
> >> issue doesn't occur any more.
> >
> > Given that it hangs very early, in arch_suspend_enable_irqs() (see my
> > other mail), I don't trust your analysis.
> >
> > I'm not using serial console on spitz, and I have never had successful
> > resume with the patch applied.
> 
> It seems that we're talking on different issue with similar symptom.
> Please check my test method. While I'm testing suspend with devices
> level, kernel is blocked in console resume. In this level, it won't
> call arch_suspend_enable_irqs(). This function call is only invoked in
> processor level or below.

For me, everything but real suspend works. I do _not_ have serial
console for spitz.

> Up to now, I can't reproduce the issue you're talking on my platform
> yet. I'll check this issue continuously. I also want to know your
> hardware information.

Spitz, aka Sharp Zaurus c3000.

Can we get the patch reverted till its fixed, so other development can
continue?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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