diff --git a/include/linux/fb.h b/include/linux/fb.h
index fe7d0d7..f563c50 100644
--- a/include/linux/fb.h
+++ b/include/linux/fb.h
@@ -961,15 +961,7 @@
 extern int num_registered_fb;
 extern struct class *fb_class;
 
-static inline int lock_fb_info(struct fb_info *info)
-{
-	mutex_lock(&info->lock);
-	if (!info->fbops) {
-		mutex_unlock(&info->lock);
-		return 0;
-	}
-	return 1;
-}
+extern int lock_fb_info(struct fb_info *info);
 
 static inline void unlock_fb_info(struct fb_info *info)
 {