make cancel_rearming_delayed_work() work on any workqueue, not just keventd_wq

cancel_rearming_delayed_workqueue(wq, dwork) doesn't need the first
parameter.  We don't hang on un-queued dwork any longer, and work->data
doesn't change its type.  This means we can always figure out "wq" from
dwork when it is needed.

Remove this parameter, and rename the function to
cancel_rearming_delayed_work().  Re-create an inline "obsolete"
cancel_rearming_delayed_workqueue(wq) which just calls
cancel_rearming_delayed_work().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 19 insertions, 21 deletions

diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 2a58f16e1961..27110c04f21e 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -191,9 +191,6 @@ extern int current_is_keventd(void);
 extern int keventd_up(void);
 
 extern void init_workqueues(void);
-void cancel_rearming_delayed_work(struct delayed_work *work);
-void cancel_rearming_delayed_workqueue(struct workqueue_struct *,
-                                       struct delayed_work *);
 int execute_in_process_context(work_func_t fn, struct execute_work *);
 
 /*
@@ -212,4 +209,14 @@ static inline int cancel_delayed_work(struct delayed_work *work)
         return ret;
 }
 
+extern void cancel_rearming_delayed_work(struct delayed_work *work);
+
+/* Obsolete. use cancel_rearming_delayed_work() */
+static inline
+void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
+                                        struct delayed_work *work)
+{
+        cancel_rearming_delayed_work(work);
+}
+
 #endif
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 985902e2e071..41eaffd125ca 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -555,32 +555,23 @@ void flush_work_keventd(struct work_struct *work)
 EXPORT_SYMBOL(flush_work_keventd);
 
 /**
- * cancel_rearming_delayed_workqueue - kill off a delayed work whose handler rearms the delayed work.
- * @wq:   the controlling workqueue structure
+ * cancel_rearming_delayed_work - kill off a delayed work whose handler rearms the delayed work.
  * @dwork: the delayed work struct
  *
  * Note that the work callback function may still be running on return from
  * cancel_delayed_work(). Run flush_workqueue() or flush_work() to wait on it.
  */
-void cancel_rearming_delayed_workqueue(struct workqueue_struct *wq,
-                                       struct delayed_work *dwork)
+void cancel_rearming_delayed_work(struct delayed_work *dwork)
 {
-        /* Was it ever queued ? */
-        if (!get_wq_data(&dwork->work))
-                return;
+        struct cpu_workqueue_struct *cwq = get_wq_data(&dwork->work);
 
-        while (!cancel_delayed_work(dwork))
-                flush_workqueue(wq);
-}
-EXPORT_SYMBOL(cancel_rearming_delayed_workqueue);
+        /* Was it ever queued ? */
+        if (cwq != NULL) {
+                struct workqueue_struct *wq = cwq->wq;
 
-/**
- * cancel_rearming_delayed_work - kill off a delayed keventd work whose handler rearms the delayed work.
- * @dwork: the delayed work struct
- */
-void cancel_rearming_delayed_work(struct delayed_work *dwork)
-{
-        cancel_rearming_delayed_workqueue(keventd_wq, dwork);
+                while (!cancel_delayed_work(dwork))
+                        flush_workqueue(wq);
+        }
 }
 EXPORT_SYMBOL(cancel_rearming_delayed_work);