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PM / wakeup: validate wakeup source before activating it.

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A rogue wakeup source not registered in wakeup_sources list is not visible
from wakeup_sources_stats_show. Check if the wakeup source is registered
properly by looking at the timer struct.

Signed-off-by: Jin Qian <jinqian@android.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jin Qian 2015-05-06 15:26:56 -07:00 committed by Rafael J. Wysocki
parent 5ebe6afaf0
commit b6ec94520c
1 changed files with 18 additions and 0 deletions
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18
drivers/base/power/wakeup.c
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@ -351,6 +351,20 @@ int device_set_wakeup_enable(struct device *dev, bool enable)
}
EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
/**
* wakeup_source_not_registered - validate the given wakeup source.
* @ws: Wakeup source to be validated.
*/
static bool wakeup_source_not_registered(struct wakeup_source *ws)
{
/*
* Use timer struct to check if the given source is initialized
* by wakeup_source_add.
*/
return ws->timer.function != pm_wakeup_timer_fn ||
ws->timer.data != (unsigned long)ws;
}
/*
* The functions below use the observation that each wakeup event starts a
* period in which the system should not be suspended. The moment this period
@ -391,6 +405,10 @@ static void wakeup_source_activate(struct wakeup_source *ws)
{
unsigned int cec;
if (WARN_ONCE(wakeup_source_not_registered(ws),
"unregistered wakeup source\n"))
return;
/*
* active wakeup source should bring the system
* out of PM_SUSPEND_FREEZE state