diff options
| author | Rafael J. Wysocki <rjw@sisk.pl> | 2012-02-17 23:39:39 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-03-04 23:08:27 +0100 |
| commit | 4782e1654bdbd30cf307da090b3c4f70157477cb (patch) | |
| tree | 72305fb2e3fff719330f5302dda785c044e25575 /drivers | |
| parent | da863cddd831b0f4bf2d067f8b75254f1be94590 (diff) | |
PM / Sleep: Make __pm_stay_awake() delete wakeup source timers
If __pm_stay_awake() is called after __pm_wakeup_event() for the same
wakep source object before its timer expires, it won't cancel the
timer, so the wakeup source will be deactivated from the timer
function as scheduled by __pm_wakeup_event(). In that case
__pm_stay_awake() doesn't have any effect beyond incrementing
the wakeup source's event_count field, although it should cancel
the timer and make the wakeup source stay active until __pm_relax()
is called for it.
To fix this problem make __pm_stay_awake() delete the wakeup source's
timer and ensure that it won't be deactivated from the timer funtion
afterwards by clearing its timer_expires field.
Reported-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/power/wakeup.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index b38bb9afb719..7c5ab70b9ef3 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -344,7 +344,6 @@ static void wakeup_source_activate(struct wakeup_source *ws) { ws->active = true; ws->active_count++; - ws->timer_expires = jiffies; ws->last_time = ktime_get(); /* Increment the counter of events in progress. */ @@ -365,9 +364,14 @@ void __pm_stay_awake(struct wakeup_source *ws) return; spin_lock_irqsave(&ws->lock, flags); + ws->event_count++; if (!ws->active) wakeup_source_activate(ws); + + del_timer(&ws->timer); + ws->timer_expires = 0; + spin_unlock_irqrestore(&ws->lock, flags); } EXPORT_SYMBOL_GPL(__pm_stay_awake); @@ -541,7 +545,7 @@ void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) if (!expires) expires = 1; - if (time_after(expires, ws->timer_expires)) { + if (!ws->timer_expires || time_after(expires, ws->timer_expires)) { mod_timer(&ws->timer, expires); ws->timer_expires = expires; } |