From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Wed, 12 Oct 2016 20:38:41 +0000 (-0700)
Subject: f2fs: fix wrong sum_page pointer in f2fs_gc
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=de0dcc40f6e24d6bac6b60e36eac4659bbbd3f00;p=openwrt%2Fstaging%2Fblogic.git

f2fs: fix wrong sum_page pointer in f2fs_gc

This patch fixes using a wrong pointer for sum_page in f2fs_gc.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 93985c64d8a8..6f14ee923acd 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -852,16 +852,16 @@ static int do_garbage_collect(struct f2fs_sb_info *sbi,
 
 	for (segno = start_segno; segno < end_segno; segno++) {
 
-		if (get_valid_blocks(sbi, segno, 1) == 0 ||
-					unlikely(f2fs_cp_error(sbi)))
-			goto next;
-
 		/* find segment summary of victim */
 		sum_page = find_get_page(META_MAPPING(sbi),
 					GET_SUM_BLOCK(sbi, segno));
-		f2fs_bug_on(sbi, !PageUptodate(sum_page));
 		f2fs_put_page(sum_page, 0);
 
+		if (get_valid_blocks(sbi, segno, 1) == 0 ||
+				!PageUptodate(sum_page) ||
+				unlikely(f2fs_cp_error(sbi)))
+			goto next;
+
 		sum = page_address(sum_page);
 		f2fs_bug_on(sbi, type != GET_SUM_TYPE((&sum->footer)));