1 files changed, 17 insertions, 18 deletions

diff --git a/kernel/locking/rwsem-xadd.c b/kernel/locking/rwsem-xadd.c
index 447e08de1fab..b03623172277 100644
--- a/kernel/locking/rwsem-xadd.c
+++ b/kernel/locking/rwsem-xadd.c
@@ -121,16 +121,17 @@ enum rwsem_wake_type {
  * - woken process blocks are discarded from the list after having task zeroed
  * - writers are only marked woken if downgrading is false
  */
-static struct rw_semaphore *
-__rwsem_mark_wake(struct rw_semaphore *sem,
-		  enum rwsem_wake_type wake_type, struct wake_q_head *wake_q)
+static void __rwsem_mark_wake(struct rw_semaphore *sem,
+			      enum rwsem_wake_type wake_type,
+			      struct wake_q_head *wake_q)
 {
 	struct rwsem_waiter *waiter;
 	struct task_struct *tsk;
 	struct list_head *next;
-	long oldcount, woken, loop, adjustment;
+	long loop, oldcount, woken = 0, adjustment = 0;
 
 	waiter = list_entry(sem->wait_list.next, struct rwsem_waiter, list);
+
 	if (waiter->type == RWSEM_WAITING_FOR_WRITE) {
 		if (wake_type == RWSEM_WAKE_ANY) {
 			/*
@@ -142,19 +143,19 @@ __rwsem_mark_wake(struct rw_semaphore *sem,
 			 */
 			wake_q_add(wake_q, waiter->task);
 		}
-		goto out;
+
+		return;
 	}
 
-	/* Writers might steal the lock before we grant it to the next reader.
+	/*
+	 * Writers might steal the lock before we grant it to the next reader.
 	 * We prefer to do the first reader grant before counting readers
 	 * so we can bail out early if a writer stole the lock.
 	 */
-	adjustment = 0;
 	if (wake_type != RWSEM_WAKE_READ_OWNED) {
 		adjustment = RWSEM_ACTIVE_READ_BIAS;
  try_reader_grant:
 		oldcount = atomic_long_fetch_add(adjustment, &sem->count);
-
 		if (unlikely(oldcount < RWSEM_WAITING_BIAS)) {
 			/*
 			 * If the count is still less than RWSEM_WAITING_BIAS
@@ -164,7 +165,8 @@ __rwsem_mark_wake(struct rw_semaphore *sem,
 			 */
 			if (atomic_long_add_return(-adjustment, &sem->count) <
 			    RWSEM_WAITING_BIAS)
-				goto out;
+				return;
+
 			/* Last active locker left. Retry waking readers. */
 			goto try_reader_grant;
 		}
@@ -176,11 +178,11 @@ __rwsem_mark_wake(struct rw_semaphore *sem,
 		rwsem_set_reader_owned(sem);
 	}
 
-	/* Grant an infinite number of read locks to the readers at the front
+	/*
+	 * Grant an infinite number of read locks to the readers at the front
 	 * of the queue.  Note we increment the 'active part' of the count by
 	 * the number of readers before waking any processes up.
 	 */
-	woken = 0;
 	do {
 		woken++;
 
@@ -219,9 +221,6 @@ __rwsem_mark_wake(struct rw_semaphore *sem,
 
 	sem->wait_list.next = next;
 	next->prev = &sem->wait_list;
-
- out:
-	return sem;
 }
 
 /*
@@ -255,7 +254,7 @@ struct rw_semaphore __sched *rwsem_down_read_failed(struct rw_semaphore *sem)
 	if (count == RWSEM_WAITING_BIAS ||
 	    (count > RWSEM_WAITING_BIAS &&
 	     adjustment != -RWSEM_ACTIVE_READ_BIAS))
-		sem = __rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
+		__rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
 
 	raw_spin_unlock_irq(&sem->wait_lock);
 	wake_up_q(&wake_q);
@@ -505,7 +504,7 @@ __rwsem_down_write_failed_common(struct rw_semaphore *sem, int state)
 		if (count > RWSEM_WAITING_BIAS) {
 			WAKE_Q(wake_q);
 
-			sem = __rwsem_mark_wake(sem, RWSEM_WAKE_READERS, &wake_q);
+			__rwsem_mark_wake(sem, RWSEM_WAKE_READERS, &wake_q);
 			/*
 			 * The wakeup is normally called _after_ the wait_lock
 			 * is released, but given that we are proactively waking
@@ -616,7 +615,7 @@ locked:
 
 	/* do nothing if list empty */
 	if (!list_empty(&sem->wait_list))
-		sem = __rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
+		__rwsem_mark_wake(sem, RWSEM_WAKE_ANY, &wake_q);
 
 	raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
 	wake_up_q(&wake_q);
@@ -640,7 +639,7 @@ struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem)
 
 	/* do nothing if list empty */
 	if (!list_empty(&sem->wait_list))
-		sem = __rwsem_mark_wake(sem, RWSEM_WAKE_READ_OWNED, &wake_q);
+		__rwsem_mark_wake(sem, RWSEM_WAKE_READ_OWNED, &wake_q);
 
 	raw_spin_unlock_irqrestore(&sem->wait_lock, flags);
 	wake_up_q(&wake_q);