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

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Date:	Mon, 2 Nov 2009 10:29:09 +0100
From:	Daniel Mack <daniel@...aq.de>
To:	Haojian Zhuang <haojian.zhuang@...il.com>
Cc:	Pavel Machek <pavel@....cz>, dsaxena@...top.org,
	alan@...ux.intel.com, gregkh@...e.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, Nov 02, 2009 at 05:22:30AM -0400, Haojian Zhuang wrote:
> >> > Ok, got it. The culprit is commit d2c37068 ("[ARM] pxa: initialize
> >> > default interrupt priority and use ICHP for IRQ handling"). Reverting it
> >> > make suspend/resume work again on my board.
> >> >
> >> > Haojian, Eric, could you have a look at this?
> >>
> >> Okay, patch is this one: I'll test reverting it shortly.
> >>
> >> commit d2c37068429b29d6549cf3486fc84b836689e122
> >> Author: Haojian Zhuang <haojian.zhuang@...vell.com>
> >> Date:   Wed Aug 19 19:49:31 2009 +0800
> >>
> >>     [ARM] pxa: initialize default interrupt priority and use ICHP for IRQ handling
> >>
> >>     Signed-off-by: Haojian Zhuang <haojian.zhuang@...vell.com>
> >>     Signed-off-by: Eric Miao <eric.y.miao@...il.com>
> >
> > And yes, reverting it _does_ fix suspend on spitz.
> >
> >                                                                        Pavel
> 
> 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.

Well no, not confirmed. I tested with no_console_suspend, and it still
hit me. And without too, btw.

Daniel
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