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

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Message-ID: <20091102122258.GA22624@elf.ucw.cz>
Date:	Mon, 2 Nov 2009 13:22:58 +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?


> >> > 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.
...
> I see. You can chech my patch in below. I need to save IPRs in suspend
> resume routine.
...
> >From 1764e836424d42a0654b8b73c402a2dddb118dc4 Mon Sep 17 00:00:00 2001
> From: Haojian Zhuang <haojian.zhuang@...vell.com>
> Date: Mon, 2 Nov 2009 14:02:21 -0500
> Subject: [PATCH] pxa: fix system resume issue on pxa27x and pxa3xx
> 
> Since interrupt handler is changed to use interrupt priority, we also need to
> save and restore these interrupt controller registers in suspend/resume
> routine.
> 
> Signed-off-by: Haojian Zhuang <haojian.zhuang@...vell.com>

Acked-by: Pavel Machek <pavel@....cz>
Tested-by: Pavel Machek <pavel@....cz>

> @@ -150,6 +150,7 @@ void __init pxa_init_irq(int irq_nr, set_wake_t fn)
> 
>  #ifdef CONFIG_PM
>  static unsigned long saved_icmr[2];
> +static unsigned long saved_ipr[128];
> 
>  static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
>  {
> @@ -159,6 +160,10 @@ static int pxa_irq_suspend(struct sys_device
> *dev, pm_message_t state)

Note: Your mail client is word-wrapping.

>  		saved_icmr[i] = _ICMR(irq);
>  		_ICMR(irq) = 0;
>  	}
> +	if (pxa_internal_irq_nr > 128)
> +		BUG();

BUG_ON()? WARN_ON() then irq_nr = 128? User is very unlikely to read
the BUG() message at this point...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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