diff --git a/fs/dirty_pages.c b/fs/dirty_pages.c
index 21e2251b6619c6f90a13ec299fc97b447e0ca1d3..0eb818b599bacea4afb3c363ab38379688ceca4c 100644
--- a/fs/dirty_pages.c
+++ b/fs/dirty_pages.c
@@ -217,12 +217,12 @@ static ssize_t seq_read_dirty(
 	}
 
 	n = min(m->count - m->from, size);
-	err = simple_read_from_buffer(buf, n,
-		(loff_t *) &m->from, m->buf, m->count);
-	if (err < 0) {
+	n -= copy_to_user(buf, m->buf + m->from, n);
+	if (unlikely(!n)) {
 		err = -EFAULT;
 		goto done;
 	}
+	m->from += n;
 	copied += n;
 done:
 	if (!copied)