workqueue: Rename __cancel_work_timer() to __cancel_timer_sync()

__cancel_work_timer() is used to implement cancel_work_sync() and
cancel_delayed_work_sync(), similarly to how __cancel_work() is used to
implement cancel_work() and cancel_delayed_work(). ie. The _timer part of
the name is a complete misnomer. The difference from __cancel_work() is the
fact that it syncs against work item execution not whether it handles timers
or not.

Let's rename it to less confusing __cancel_work_sync(). No functional
change.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com>

kernel/workqueue.c

@@ -4075,7 +4075,7 @@ static int cwt_wakefn(wait_queue_entry_t *wait, unsigned mode, int sync, void *k
 	return autoremove_wake_function(wait, mode, sync, key);
 }
 
-static bool __cancel_work_timer(struct work_struct *work, bool is_dwork)
+static bool __cancel_work_sync(struct work_struct *work, bool is_dwork)
 {
 	static DECLARE_WAIT_QUEUE_HEAD(cancel_waitq);
 	unsigned long flags;
@@ -4159,7 +4159,7 @@ static bool __cancel_work_timer(struct work_struct *work, bool is_dwork)
  */
 bool cancel_work_sync(struct work_struct *work)
 {
-	return __cancel_work_timer(work, false);
+	return __cancel_work_sync(work, false);
 }
 EXPORT_SYMBOL_GPL(cancel_work_sync);
 
@@ -4264,7 +4264,7 @@ EXPORT_SYMBOL(cancel_delayed_work);
  */
 bool cancel_delayed_work_sync(struct delayed_work *dwork)
 {
-	return __cancel_work_timer(&dwork->work, true);
+	return __cancel_work_sync(&dwork->work, true);
 }
 EXPORT_SYMBOL(cancel_delayed_work_sync);