linux-kernel - Re: [bisected][bug] commit e978aa7d7d57d04eb5f88 breaks suspend on laptop.

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Date:	Sat, 12 Nov 2011 10:21:48 -0300
From:	"Tomas M." <tmezzadra@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	deepthi@...ux.vnet.ibm.com, g.trinabh@...il.com, j-pihet@...com,
	khilman@...com, arjan@...ux.intel.com, len.brown@...el.com,
	Arjan van de Ven <arjan@...radead.org>,
	Len Brown <lenb@...nel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ferenc Wagner <wferi@...f.hu>
Subject: Re: [bisected][bug] commit e978aa7d7d57d04eb5f88 breaks suspend on
 laptop.

Yes, it was acpi_idle, and  the proposed patch fixed the problem.


On 11/11/2011 10:50 PM, Rafael J. Wysocki wrote:
> On Saturday, November 12, 2011, Rafael J. Wysocki wrote:
>> On Friday, November 11, 2011, Tomas M. wrote:
>>> yes, that helps.
>> What does "cat /sys/devices/system/cpu/cpuidle/current_driver" show?
> If that's "acpi_idle", the appended patch should help (it works for
> me at least).
>
> Thanks,
> Rafael
>
> ---
> From: Rafael J. Wysocki<rjw@...k.pl>
> Subject: ACPI / cpuidle: Remove acpi_idle_suspend (to fix suspend regression)
>
> After commit e978aa7d7d57d04eb5f88a7507c4fb98577def77 (cpuidle: Move
> dev->last_residency update to driver enter routine; remove
> dev->last_state) setting acpi_idle_suspend to 1 by
> acpi_processor_suspend() causes the ACPI cpuidle routines to return
> error codes continuously, which in turn causes cpuidle to lock up
> (hard).  However, acpi_idle_suspend doesn't appear to be useful for
> any purpose (it's racy and doesn't really provide any real
> protection), so it can be removed, which makes the problem go away.
>
> Signed-off-by: Rafael J. Wysocki<rjw@...k.pl>
> ---
>   drivers/acpi/processor_idle.c |   29 -----------------------------
>   1 file changed, 29 deletions(-)
>
> Index: linux/drivers/acpi/processor_idle.c
> ===================================================================
> --- linux.orig/drivers/acpi/processor_idle.c
> +++ linux/drivers/acpi/processor_idle.c
> @@ -224,7 +224,6 @@ static void lapic_timer_state_broadcast(
>   /*
>    * Suspend / resume control
>    */
> -static int acpi_idle_suspend;
>   static u32 saved_bm_rld;
>
>   static void acpi_idle_bm_rld_save(void)
> @@ -243,21 +242,13 @@ static void acpi_idle_bm_rld_restore(voi
>
>   int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
>   {
> -	if (acpi_idle_suspend == 1)
> -		return 0;
> -
>   	acpi_idle_bm_rld_save();
> -	acpi_idle_suspend = 1;
>   	return 0;
>   }
>
>   int acpi_processor_resume(struct acpi_device * device)
>   {
> -	if (acpi_idle_suspend == 0)
> -		return 0;
> -
>   	acpi_idle_bm_rld_restore();
> -	acpi_idle_suspend = 0;
>   	return 0;
>   }
>
> @@ -763,13 +754,6 @@ static int acpi_idle_enter_c1(struct cpu
>
>   	local_irq_disable();
>
> -	/* Do not access any ACPI IO ports in suspend path */
> -	if (acpi_idle_suspend) {
> -		local_irq_enable();
> -		cpu_relax();
> -		return -EINVAL;
> -	}
> -
>   	lapic_timer_state_broadcast(pr, cx, 1);
>   	kt1 = ktime_get_real();
>   	acpi_idle_do_entry(cx);
> @@ -810,13 +794,6 @@ static int acpi_idle_enter_simple(struct
>
>   	local_irq_disable();
>
> -	if (acpi_idle_suspend) {
> -		local_irq_enable();
> -		cpu_relax();
> -		return -EINVAL;
> -	}
> -
> -
>   	if (cx->entry_method != ACPI_CSTATE_FFH) {
>   		current_thread_info()->status&= ~TS_POLLING;
>   		/*
> @@ -895,12 +872,6 @@ static int acpi_idle_enter_bm(struct cpu
>   	if (unlikely(!pr))
>   		return -EINVAL;
>
> -
> -	if (acpi_idle_suspend) {
> -		cpu_relax();
> -		return -EINVAL;
> -	}
> -
>   	if (!cx->bm_sts_skip&&  acpi_idle_bm_check()) {
>   		if (drv->safe_state_index>= 0) {
>   			return drv->states[drv->safe_state_index].enter(dev,
--
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