[PATCH] unlock_page when get_swap_bio fails

[Hugh Dickins]

swap_readpage and swap_writepage forgot
to unlock_page if get_swap_bio failed.

Patch applies to 2.5.47 or 2.5.47-mm1.

--- 2.5.47/mm/page_io.c	Mon Oct  7 20:37:50 2002
+++ linux/mm/page_io.c	Mon Nov 11 17:01:27 2002
@@ -97,6 +97,7 @@
 	bio = get_swap_bio(GFP_NOIO, page, end_swap_bio_write);
 	if (bio == NULL) {
 		set_page_dirty(page);
+		unlock_page(page);
 		ret = -ENOMEM;
 		goto out;
 	}
@@ -116,6 +117,7 @@
 	ClearPageUptodate(page);
 	bio = get_swap_bio(GFP_KERNEL, page, end_swap_bio_read);
 	if (bio == NULL) {
+		unlock_page(page);
 		ret = -ENOMEM;
 		goto out;
 	}