diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/suspend.c | 37 |
1 files changed, 33 insertions, 4 deletions
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 396d262b8fd..e53c663a5e9 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -23,6 +23,7 @@ #include <linux/slab.h> #include <linux/export.h> #include <linux/suspend.h> +#include <linux/kthread.h> #include <linux/syscore_ops.h> #include <trace/events/power.h> @@ -35,6 +36,10 @@ const char *const pm_states[PM_SUSPEND_MAX] = { static const struct platform_suspend_ops *suspend_ops; +static struct completion second_cpu_complete = {1, + __WAIT_QUEUE_HEAD_INITIALIZER((second_cpu_complete).wait) +}; + /** * suspend_set_ops - Set the global suspend method table. * @ops: Suspend operations to use. @@ -157,9 +162,10 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) if (suspend_test(TEST_PLATFORM)) goto Platform_wake; + error = disable_nonboot_cpus(); if (error || suspend_test(TEST_CPUS)) - goto Enable_cpus; + goto Platform_wake; arch_suspend_disable_irqs(); BUG_ON(!irqs_disabled()); @@ -177,9 +183,6 @@ static int suspend_enter(suspend_state_t state, bool *wakeup) arch_suspend_enable_irqs(); BUG_ON(irqs_disabled()); - Enable_cpus: - enable_nonboot_cpus(); - Platform_wake: if (suspend_ops->wake) suspend_ops->wake(); @@ -257,6 +260,18 @@ static void suspend_finish(void) pm_restore_console(); } +static int plug_secondary_cpus(void *data) +{ + if (!(suspend_test(TEST_FREEZER) || + suspend_test(TEST_DEVICES) || + suspend_test(TEST_PLATFORM))) + enable_nonboot_cpus(); + + complete(&second_cpu_complete); + + return 0; +} + /** * enter_state - Do common work needed to enter system sleep state. * @state: System sleep state to enter. @@ -268,6 +283,7 @@ static void suspend_finish(void) static int enter_state(suspend_state_t state) { int error; + struct task_struct *cpu_task; if (!valid_state(state)) return -ENODEV; @@ -275,6 +291,14 @@ static int enter_state(suspend_state_t state) if (!mutex_trylock(&pm_mutex)) return -EBUSY; + /* + * Assure that previous started thread is completed before + * attempting to suspend again. + */ + error = wait_for_completion_timeout(&second_cpu_complete, + msecs_to_jiffies(500)); + WARN_ON(error == 0); + printk(KERN_INFO "PM: Syncing filesystems ... "); sys_sync(); printk("done.\n"); @@ -296,6 +320,11 @@ static int enter_state(suspend_state_t state) pr_debug("PM: Finishing wakeup.\n"); suspend_finish(); Unlock: + + cpu_task = kthread_run(plug_secondary_cpus, + NULL, "cpu-plug"); + BUG_ON(IS_ERR(cpu_task)); + mutex_unlock(&pm_mutex); return error; } |