/* * kernel/power/autosleep.c * * Opportunistic sleep support. * * Copyright (C) 2012 Rafael J. Wysocki */ #include #include #include #include "power.h" static suspend_state_t autosleep_state; static struct workqueue_struct *autosleep_wq; /* * Note: it is only safe to mutex_lock(&autosleep_lock) if a wakeup_source * is active, otherwise a deadlock with try_to_suspend() is possible. * Alternatively mutex_lock_interruptible() can be used. This will then fail * if an auto_sleep cycle tries to freeze processes. */ static DEFINE_MUTEX(autosleep_lock); static struct wakeup_source *autosleep_ws; static void try_to_suspend(struct work_struct *work) { unsigned int initial_count, final_count; if (!pm_get_wakeup_count(&initial_count, true)) goto out; mutex_lock(&autosleep_lock); if (!pm_save_wakeup_count(initial_count) || system_state != SYSTEM_RUNNING) { mutex_unlock(&autosleep_lock); goto out; } if (autosleep_state == PM_SUSPEND_ON) { mutex_unlock(&autosleep_lock); return; } if (autosleep_state >= PM_SUSPEND_MAX) hibernate(); else pm_suspend(autosleep_state); mutex_unlock(&autosleep_lock); if (!pm_get_wakeup_count(&final_count, false)) goto out; /* * If the wakeup occured for an unknown reason, wait to prevent the * system from trying to suspend and waking up in a tight loop. */ if (final_count == initial_count) schedule_timeout_uninterruptible(HZ / 2); out: queue_up_suspend_work(); } static DECLARE_WORK(suspend_work, try_to_suspend); void queue_up_suspend_work(void) { if (autosleep_state > PM_SUSPEND_ON) queue_work(autosleep_wq, &suspend_work); } suspend_state_t pm_autosleep_state(void) { return autosleep_state; } int pm_autosleep_lock(void) { return mutex_lock_interruptible(&autosleep_lock); } void pm_autosleep_unlock(void) { mutex_unlock(&autosleep_lock); } int pm_autosleep_set_state(suspend_state_t state) { #ifndef CONFIG_HIBERNATION if (state >= PM_SUSPEND_MAX) return -EINVAL; #endif __pm_stay_awake(autosleep_ws); mutex_lock(&autosleep_lock); autosleep_state = state; __pm_relax(autosleep_ws); if (state > PM_SUSPEND_ON) { pm_wakep_autosleep_enabled(true); queue_up_suspend_work(); } else { pm_wakep_autosleep_enabled(false); } mutex_unlock(&autosleep_lock); return 0; } int __init pm_autosleep_init(void) { autosleep_ws = wakeup_source_register("autosleep"); if (!autosleep_ws) return -ENOMEM; autosleep_wq = alloc_ordered_workqueue("autosleep", 0); if (autosleep_wq) return 0; wakeup_source_unregister(autosleep_ws); return -ENOMEM; } n>
path: root/sound/soc/codecs/mc13783.c
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authorPeter Zijlstra <peterz@infradead.org>2017-01-26 23:15:08 +0100
committerIngo Molnar <mingo@kernel.org>2017-01-30 11:41:26 +0100
commit0b3589be9b98994ce3d5aeca52445d1f5627c4ba (patch)
tree85d0d9b3ac902af2c938b19a566884caf8d00323 /sound/soc/codecs/mc13783.c
parenta76a82a3e38c8d3fb6499e3dfaeb0949241ab588 (diff)
perf/core: Fix PERF_RECORD_MMAP2 prot/flags for anonymous memory
Andres reported that MMAP2 records for anonymous memory always have their protection field 0. Turns out, someone daft put the prot/flags generation code in the file branch, leaving them unset for anonymous memory. Reported-by: Andres Freund <andres@anarazel.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Don Zickus <dzickus@redhat.com Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@gmail.com> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: acme@kernel.org Cc: anton@ozlabs.org Cc: namhyung@kernel.org Cc: stable@vger.kernel.org # v3.16+ Fixes: f972eb63b100 ("perf: Pass protection and flags bits through mmap2 interface") Link: http://lkml.kernel.org/r/20170126221508.GF6536@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/soc/codecs/mc13783.c')