Messages in this thread | | | Date | Sat, 25 Apr 2015 22:12:25 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH 1/3] power: validate wakeup source before activating it. |
| |
On Wed 2015-04-22 17:50:10, Jin Qian wrote: > 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 function.
How often does that happen?
Will people on your systems actually notice that pr_err()? Pavel
> Signed-off-by: Jin Qian <jinqian@android.com> > --- > drivers/base/power/wakeup.c | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c > index 7726200..f24c622 100644 > --- a/drivers/base/power/wakeup.c > +++ b/drivers/base/power/wakeup.c > @@ -14,6 +14,7 @@ > #include <linux/suspend.h> > #include <linux/seq_file.h> > #include <linux/debugfs.h> > +#include <linux/types.h> > #include <trace/events/power.h> > > #include "power.h" > @@ -351,6 +352,19 @@ int device_set_wakeup_enable(struct device *dev, bool enable) > } > EXPORT_SYMBOL_GPL(device_set_wakeup_enable); > > +/** > + * validate_wakeup_source - validate the given wakeup source. > + * @ws: Wakeup source to be validated. > + */ > +static bool validate_wakeup_source(struct wakeup_source *ws) > +{ > + /* > + * Use timer function to check if the given source is initialized > + * by wakeup_source_add. > + */ > + return ws->timer.function == pm_wakeup_timer_fn; > +} > + > /* > * 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 +405,11 @@ static void wakeup_source_activate(struct wakeup_source *ws) > { > unsigned int cec; > > + if (!validate_wakeup_source(ws)) { > + pr_err("unregistered wakeup source: %s\n", ws->name); > + return; > + } > + > /* > * active wakeup source should bring the system > * out of PM_SUSPEND_FREEZE state
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
| |