staging/android: sync: remove interfaces that are not used

These interfaces are not used nor have plans to be used in the near
future so remove them for a cleaner solution before de-staging the sync
framework.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/sync.c

@@ -317,62 +317,6 @@ struct sync_fence *sync_fence_merge(const char *name,
 }
 EXPORT_SYMBOL(sync_fence_merge);
 
-int sync_fence_wake_up_wq(wait_queue_t *curr, unsigned mode,
-			  int wake_flags, void *key)
-{
-	struct sync_fence_waiter *wait;
-
-	wait = container_of(curr, struct sync_fence_waiter, work);
-	list_del_init(&wait->work.task_list);
-
-	wait->callback(wait->work.private, wait);
-	return 1;
-}
-
-int sync_fence_wait_async(struct sync_fence *fence,
-			  struct sync_fence_waiter *waiter)
-{
-	int err = atomic_read(&fence->status);
-	unsigned long flags;
-
-	if (err < 0)
-		return err;
-
-	if (!err)
-		return 1;
-
-	init_waitqueue_func_entry(&waiter->work, sync_fence_wake_up_wq);
-	waiter->work.private = fence;
-
-	spin_lock_irqsave(&fence->wq.lock, flags);
-	err = atomic_read(&fence->status);
-	if (err > 0)
-		__add_wait_queue_tail(&fence->wq, &waiter->work);
-	spin_unlock_irqrestore(&fence->wq.lock, flags);
-
-	if (err < 0)
-		return err;
-
-	return !err;
-}
-EXPORT_SYMBOL(sync_fence_wait_async);
-
-int sync_fence_cancel_async(struct sync_fence *fence,
-			    struct sync_fence_waiter *waiter)
-{
-	unsigned long flags;
-	int ret = 0;
-
-	spin_lock_irqsave(&fence->wq.lock, flags);
-	if (!list_empty(&waiter->work.task_list))
-		list_del_init(&waiter->work.task_list);
-	else
-		ret = -ENOENT;
-	spin_unlock_irqrestore(&fence->wq.lock, flags);
-	return ret;
-}
-EXPORT_SYMBOL(sync_fence_cancel_async);
-
 int sync_fence_wait(struct sync_fence *fence, long timeout)
 {
 	long ret;

drivers/staging/android/sync.h

@@ -159,27 +159,6 @@ struct sync_fence {
 	struct sync_fence_cb	cbs[];
 };
 
-struct sync_fence_waiter;
-typedef void (*sync_callback_t)(struct sync_fence *fence,
-				struct sync_fence_waiter *waiter);
-
-/**
- * struct sync_fence_waiter - metadata for asynchronous waiter on a fence
- * @work:		wait_queue for the fence waiter
- * @callback:		function pointer to call when fence signals
- */
-struct sync_fence_waiter {
-	wait_queue_t work;
-	sync_callback_t callback;
-};
-
-static inline void sync_fence_waiter_init(struct sync_fence_waiter *waiter,
-					  sync_callback_t callback)
-{
-	INIT_LIST_HEAD(&waiter->work.task_list);
-	waiter->callback = callback;
-}
-
 /*
  * API for sync_timeline implementers
  */
@@ -303,33 +282,6 @@ void sync_fence_put(struct sync_fence *fence);
  */
 void sync_fence_install(struct sync_fence *fence, int fd);
 
-/**
- * sync_fence_wait_async() - registers and async wait on the fence
- * @fence:		fence to wait on
- * @waiter:		waiter callback struck
- *
- * Registers a callback to be called when @fence signals or has an error.
- * @waiter should be initialized with sync_fence_waiter_init().
- *
- * Returns 1 if @fence has already signaled, 0 if not or <0 if error.
- */
-int sync_fence_wait_async(struct sync_fence *fence,
-			  struct sync_fence_waiter *waiter);
-
-/**
- * sync_fence_cancel_async() - cancels an async wait
- * @fence:		fence to wait on
- * @waiter:		waiter callback struck
- *
- * Cancels a previously registered async wait.  Will fail gracefully if
- * @waiter was never registered or if @fence has already signaled @waiter.
- *
- * Returns 0 if waiter was removed from fence's async waiter list.
- * Returns -ENOENT if waiter was not found on fence's async waiter list.
- */
-int sync_fence_cancel_async(struct sync_fence *fence,
-			    struct sync_fence_waiter *waiter);
-
 /**
  * sync_fence_wait() - wait on fence
  * @fence:	fence to wait on
@@ -357,7 +309,5 @@ void sync_dump(void);
 # define sync_fence_debug_remove(fence)
 # define sync_dump()
 #endif
-int sync_fence_wake_up_wq(wait_queue_t *curr, unsigned mode,
-				 int wake_flags, void *key);
 
 #endif /* _LINUX_SYNC_H */

drivers/staging/android/sync_debug.c

@@ -151,8 +151,6 @@ static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
 
 static void sync_print_fence(struct seq_file *s, struct sync_fence *fence)
 {
-	wait_queue_t *pos;
-	unsigned long flags;
 	int i;
 
 	seq_printf(s, "[%p] %s: %s\n", fence, fence->name,
@@ -160,19 +158,6 @@ static void sync_print_fence(struct seq_file *s, struct sync_fence *fence)
 
 	for (i = 0; i < fence->num_fences; ++i)
 		sync_print_pt(s, fence->cbs[i].sync_pt, true);
-
-	spin_lock_irqsave(&fence->wq.lock, flags);
-	list_for_each_entry(pos, &fence->wq.task_list, task_list) {
-		struct sync_fence_waiter *waiter;
-
-		if (pos->func != &sync_fence_wake_up_wq)
-			continue;
-
-		waiter = container_of(pos, struct sync_fence_waiter, work);
-
-		seq_printf(s, "waiter %pF\n", waiter->callback);
-	}
-	spin_unlock_irqrestore(&fence->wq.lock, flags);
 }
 
 static int sync_debugfs_show(struct seq_file *s, void *unused)