linux-kernel - Re: kernel panic after suspend/resume

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Date:	Wed, 18 Apr 2012 13:03:34 +0200
From:	Sven Joachim <svenjoac@....de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: kernel panic after suspend/resume

Am 18.04.2012 um 12:08 schrieb Thomas Gleixner:

> On Wed, 18 Apr 2012, Sven Joachim wrote:
>
>> On 2012-04-17 23:21 +0200, Rafael J. Wysocki wrote:
>> 
>> > Well, commit fa4da365bc7772c kind of looks like it might be the source of
>> > this trouble.  Sven, can you try to revert it, please?
>> 
>> This seems to do the trick, thanks.
>
> Can you try the following patch instead?

Appears to work fine, thanks.

> diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
> index bf57abd..119aca5 100644
> --- a/kernel/time/tick-broadcast.c
> +++ b/kernel/time/tick-broadcast.c
> @@ -531,7 +531,6 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
>  		int was_periodic = bc->mode == CLOCK_EVT_MODE_PERIODIC;
>  
>  		bc->event_handler = tick_handle_oneshot_broadcast;
> -		clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
>  
>  		/* Take the do_timer update */
>  		tick_do_timer_cpu = cpu;
> @@ -549,6 +548,7 @@ void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
>  			   to_cpumask(tmpmask));
>  
>  		if (was_periodic && !cpumask_empty(to_cpumask(tmpmask))) {
> +			clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
>  			tick_broadcast_init_next_event(to_cpumask(tmpmask),
>  						       tick_next_period);
>  			tick_broadcast_set_event(tick_next_period, 1);
> @@ -577,15 +577,10 @@ void tick_broadcast_switch_to_oneshot(void)
>  	raw_spin_lock_irqsave(&tick_broadcast_lock, flags);
>  
>  	tick_broadcast_device.mode = TICKDEV_MODE_ONESHOT;
> -
> -	if (cpumask_empty(tick_get_broadcast_mask()))
> -		goto end;
> -
>  	bc = tick_broadcast_device.evtdev;
>  	if (bc)
>  		tick_broadcast_setup_oneshot(bc);
>  
> -end:
>  	raw_spin_unlock_irqrestore(&tick_broadcast_lock, flags);
>  }
--
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