On Wednesday, June 19, 2019 7:51:42 PM CEST Ravi Chandra Sadineni wrote: > events_check_enabled bool is set when wakeup_count sysfs attribute > is written. User level daemon is expected to write this attribute > just before suspend. > > When this boolean is set, calls to pm_wakeup_event() will result in > increment of per device and global wakeup count that helps in > identifying the wake source. global wakeup count is also used by > pm_wakeup_pending() to identify if there are any pending events that > should result in an suspend abort. > > Currently calls to pm_wakeup_pending() also clears events_check_enabled. > This can be a problem when there are multiple wake events or when the > suspend is aborted due to an interrupt on a shared interrupt line. > For example an Mfd device can create several platform devices which > might fetch the state on resume in the driver resume method and increment > the wakeup count if needed. But if events_check_enabled is cleared before > resume methods get to execute, wakeup count will not be incremented. Thus > let us not reset the bool here. > > Note that events_check_enabled is also cleared in suspend.c/enter_state() > on every resume at the end. > > Signed-off-by: Ravi Chandra Sadineni <ravisadin...@chromium.org> > --- > drivers/base/power/wakeup.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c > index 5b2b6a05a4f3..88aade871589 100644 > --- a/drivers/base/power/wakeup.c > +++ b/drivers/base/power/wakeup.c > @@ -838,7 +838,6 @@ bool pm_wakeup_pending(void) > > split_counters(&cnt, &inpr); > ret = (cnt != saved_count || inpr > 0); > - events_check_enabled = !ret;
This effectively changes the meaning of the wakeup_count metric. so it cannot be applied. > } > raw_spin_unlock_irqrestore(&events_lock, flags); > >