dm vdo: remove vdo_perform_once

Remove obsolete function vdo_perform_once. Instead, initialize
necessary module state when loading the module.

Signed-off-by: Matthew Sakai <msakai@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

1 files changed, 1 insertions, 27 deletions

diff --git a/drivers/md/dm-vdo/thread-utils.c b/drivers/md/dm-vdo/thread-utils.c
index bd620be61c1d..ec08478dd013 100644
--- a/drivers/md/dm-vdo/thread-utils.c
+++ b/drivers/md/dm-vdo/thread-utils.c
@@ -17,7 +17,6 @@
 
 static struct hlist_head thread_list;
 static struct mutex thread_mutex;
-static atomic_t thread_once = ATOMIC_INIT(0);
 
 struct thread {
 	void (*thread_function)(void *thread_data);
@@ -27,31 +26,7 @@ struct thread {
 	struct completion thread_done;
 };
 
-#define ONCE_NOT_DONE 0
-#define ONCE_IN_PROGRESS 1
-#define ONCE_COMPLETE 2
-
-/* Run a function once only, and record that fact in the atomic value. */
-void vdo_perform_once(atomic_t *once, void (*function)(void))
-{
-	for (;;) {
-		switch (atomic_cmpxchg(once, ONCE_NOT_DONE, ONCE_IN_PROGRESS)) {
-		case ONCE_NOT_DONE:
-			function();
-			atomic_set_release(once, ONCE_COMPLETE);
-			return;
-		case ONCE_IN_PROGRESS:
-			cond_resched();
-			break;
-		case ONCE_COMPLETE:
-			return;
-		default:
-			return;
-		}
-	}
-}
-
-static void thread_init(void)
+void vdo_initialize_threads_mutex(void)
 {
 	mutex_init(&thread_mutex);
 }
@@ -62,7 +37,6 @@ static int thread_starter(void *arg)
 	struct thread *thread = arg;
 
 	thread->thread_task = current;
-	vdo_perform_once(&thread_once, thread_init);
 	mutex_lock(&thread_mutex);
 	hlist_add_head(&thread->thread_links, &thread_list);
 	mutex_unlock(&thread_mutex);