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SubjectRe: [bisected][bug] commit e978aa7d7d57d04eb5f88 breaks suspend on laptop.
Date
On Saturday, November 12, 2011, Tomas M. wrote:
> Yes, it was acpi_idle, and the proposed patch fixed the problem.

Great, thanks!

Rafael


> 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@sisk.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@sisk.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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