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authorViresh Kumar <viresh.kumar@linaro.org>2019-03-08 15:23:11 +0530
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-03-23 08:44:39 +0100
commit06a7cc29d18aa04c3bbac3f61f33376369ab73d1 (patch)
treea2eec702ab7a1965bf5be30e0cccc68149f12038 /drivers/base
parentd18bcfe455106b23aa254d1da0c1a7f39b9b20fe (diff)
PM / wakeup: Rework wakeup source timer cancellation
commit 1fad17fb1bbcd73159c2b992668a6957ecc5af8a upstream. If wakeup_source_add() is called right after wakeup_source_remove() for the same wakeup source, timer_setup() may be called for a potentially scheduled timer which is incorrect. To avoid that, move the wakeup source timer cancellation from wakeup_source_drop() to wakeup_source_remove(). Moreover, make wakeup_source_remove() clear the timer function after canceling the timer to let wakeup_source_not_registered() treat unregistered wakeup sources in the same way as the ones that have never been registered. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: 4.4+ <stable@vger.kernel.org> # 4.4+ [ rjw: Subject, changelog, merged two patches together ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/wakeup.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index e613633ffe9c..4e01bf65317a 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -113,7 +113,6 @@ void wakeup_source_drop(struct wakeup_source *ws)
if (!ws)
return;
- del_timer_sync(&ws->timer);
__pm_relax(ws);
}
EXPORT_SYMBOL_GPL(wakeup_source_drop);
@@ -201,6 +200,13 @@ void wakeup_source_remove(struct wakeup_source *ws)
list_del_rcu(&ws->entry);
spin_unlock_irqrestore(&events_lock, flags);
synchronize_srcu(&wakeup_srcu);
+
+ del_timer_sync(&ws->timer);
+ /*
+ * Clear timer.function to make wakeup_source_not_registered() treat
+ * this wakeup source as not registered.
+ */
+ ws->timer.function = NULL;
}
EXPORT_SYMBOL_GPL(wakeup_source_remove);