[WORKQUEUE]: Add cancel_rearming_delayed_work()

From: Arjan van de Ven <arjan@infradead.org>

cancel_rearming_delayed_workqueue() is only used inside workqueue.c; make
this function static (the more useful wrapper around it later in that
function remains non-static and exported)

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 0 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 3993f7bdf5c2..f66befa4320f 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -423,6 +423,30 @@ void flush_scheduled_work(void)
 	flush_workqueue(keventd_wq);
 }
 
+/**
+ * cancel_rearming_delayed_workqueue - reliably kill off a delayed
+ *			work whose handler rearms the delayed work.
+ * @wq:   the controlling workqueue structure
+ * @work: the delayed work struct
+ */
+static void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
+					struct work_struct *work)
+{
+	while (!cancel_delayed_work(work))
+		flush_workqueue(wq);
+}
+
+/**
+ * cancel_rearming_delayed_work - reliably kill off a delayed keventd
+ *			work whose handler rearms the delayed work.
+ * @work: the delayed work struct
+ */
+void cancel_rearming_delayed_work(struct work_struct *work)
+{
+	cancel_rearming_delayed_workqueue(keventd_wq, work);
+}
+EXPORT_SYMBOL(cancel_rearming_delayed_work);
+
 int keventd_up(void)
 {
 	return keventd_wq != NULL;