libceph: rename con_work() to ceph_con_workfn()

Even though it's static, con_work(), being a work func, shows up in
various stacktraces a lot.  Prefix it with ceph_.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

net/ceph/messenger.c

@@ -176,7 +176,7 @@ static struct lock_class_key socket_class;
 
 static void queue_con(struct ceph_connection *con);
 static void cancel_con(struct ceph_connection *con);
-static void con_work(struct work_struct *);
+static void ceph_con_workfn(struct work_struct *);
 static void con_fault(struct ceph_connection *con);
 
 /*
@@ -749,7 +749,7 @@ void ceph_con_init(struct ceph_connection *con, void *private,
 	mutex_init(&con->mutex);
 	INIT_LIST_HEAD(&con->out_queue);
 	INIT_LIST_HEAD(&con->out_sent);
-	INIT_DELAYED_WORK(&con->work, con_work);
+	INIT_DELAYED_WORK(&con->work, ceph_con_workfn);
 
 	con->state = CON_STATE_CLOSED;
 }
@@ -2799,7 +2799,7 @@ static void con_fault_finish(struct ceph_connection *con)
 /*
  * Do some work on a connection.  Drop a connection ref when we're done.
  */
-static void con_work(struct work_struct *work)
+static void ceph_con_workfn(struct work_struct *work)
 {
 	struct ceph_connection *con = container_of(work, struct ceph_connection,
 						   work.work);