diff --git a/[refs] b/[refs]
index 99b8b35dd899..95fd2a868453 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 001281881067a5998384c6669bc8dbbbab8456c4
+refs/heads/master: 45726cb43d11b288c58243a26010f397054222f0
diff --git a/trunk/mm/filemap.c b/trunk/mm/filemap.c
index b436cbb3a834..7989c44cb293 100644
--- a/trunk/mm/filemap.c
+++ b/trunk/mm/filemap.c
@@ -621,26 +621,27 @@ struct page *find_lock_page(struct address_space *mapping,
 {
 	struct page *page;
 
-	read_lock_irq(&mapping->tree_lock);
 repeat:
+	read_lock_irq(&mapping->tree_lock);
 	page = radix_tree_lookup(&mapping->page_tree, offset);
 	if (page) {
 		page_cache_get(page);
 		if (TestSetPageLocked(page)) {
 			read_unlock_irq(&mapping->tree_lock);
 			__lock_page(page);
-			read_lock_irq(&mapping->tree_lock);
 
 			/* Has the page been truncated while we slept? */
-			if (unlikely(page->mapping != mapping ||
-				     page->index != offset)) {
+			if (unlikely(page->mapping != mapping)) {
 				unlock_page(page);
 				page_cache_release(page);
 				goto repeat;
 			}
+			VM_BUG_ON(page->index != offset);
+			goto out;
 		}
 	}
 	read_unlock_irq(&mapping->tree_lock);
+out:
 	return page;
 }
 EXPORT_SYMBOL(find_lock_page);