diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index f1d30f6..8ebd9f8 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -255,16 +255,11 @@
 	if (change || left < size) {
 		/* This is the slow path - looking for new buffers to use */
 		if ((n = tty_buffer_alloc(port, size)) != NULL) {
-			unsigned long iflags;
-
 			n->flags = flags;
 			buf->tail = n;
-
-			spin_lock_irqsave(&buf->flush_lock, iflags);
 			b->commit = b->used;
+			smp_mb();
 			b->next = n;
-			spin_unlock_irqrestore(&buf->flush_lock, iflags);
-
 		} else if (change)
 			size = 0;
 		else
@@ -448,7 +443,6 @@
 	mutex_lock(&buf->lock);
 
 	while (1) {
-		unsigned long flags;
 		struct tty_buffer *head = buf->head;
 		int count;
 
@@ -456,19 +450,14 @@
 		if (atomic_read(&buf->priority))
 			break;
 
-		spin_lock_irqsave(&buf->flush_lock, flags);
 		count = head->commit - head->read;
 		if (!count) {
-			if (head->next == NULL) {
-				spin_unlock_irqrestore(&buf->flush_lock, flags);
+			if (head->next == NULL)
 				break;
-			}
 			buf->head = head->next;
-			spin_unlock_irqrestore(&buf->flush_lock, flags);
 			tty_buffer_free(port, head);
 			continue;
 		}
-		spin_unlock_irqrestore(&buf->flush_lock, flags);
 
 		count = receive_buf(tty, head, count);
 		if (!count)
@@ -523,7 +512,6 @@
 	struct tty_bufhead *buf = &port->buf;
 
 	mutex_init(&buf->lock);
-	spin_lock_init(&buf->flush_lock);
 	tty_buffer_reset(&buf->sentinel, 0);
 	buf->head = &buf->sentinel;
 	buf->tail = &buf->sentinel;
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 036cccd..1c3316a 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -61,7 +61,6 @@
 	struct tty_buffer *head;	/* Queue head */
 	struct work_struct work;
 	struct mutex	   lock;
-	spinlock_t	   flush_lock;
 	atomic_t	   priority;
 	struct tty_buffer sentinel;
 	struct llist_head free;		/* Free queue head */