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authorViresh Kumar <viresh.kumar@linaro.org>2019-03-08 12:53:11 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-03-12 11:40:48 +0300
commit1fad17fb1bbcd73159c2b992668a6957ecc5af8a (patch)
tree9d1a61b0ac467950e8f6d7c4205de35bda10fe96 /drivers/base/power/wakeup.c
parentef8006846a3a97d9d8bf49e63dba948d0d2dbbf0 (diff)
downloadlinux-1fad17fb1bbcd73159c2b992668a6957ecc5af8a.tar.xz
PM / wakeup: Rework wakeup source timer cancellation
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>
Diffstat (limited to 'drivers/base/power/wakeup.c')
-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 f1fee72ed970..a25d2d82f44d 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -118,7 +118,6 @@ 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);
@@ -205,6 +204,13 @@ void wakeup_source_remove(struct wakeup_source *ws)
list_del_rcu(&ws->entry);
raw_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);