From 3439a8da16bcad6b0982ece938c9f8299bb53584 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 12 Nov 2011 23:17:27 +0100 Subject: [PATCH] ACPI / cpuidle: Remove acpi_idle_suspend (to fix suspend regression) After commit e978aa7d7d57 ("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 particular purpose (it's racy and doesn't really provide any real protection), so it can be removed, which makes the problem go away. Reported-and-tested-by: Tomas M. Reported-and-tested-by: Ferenc Wagner Tested-by: Arnd Bergmann Signed-off-by: Rafael J. Wysocki Signed-off-by: Linus Torvalds --- drivers/acpi/processor_idle.c | 29 ----------------------------- 1 file changed, 29 deletions(-) diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 73b2909..0e8e2de 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -224,7 +224,6 @@ static void lapic_timer_state_broadcast(struct acpi_processor *pr, /* * 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(void) 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 cpuidle_device *dev, 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 cpuidle_device *dev, 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 cpuidle_device *dev, 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, -- 2.7.4