This includes fixing a bug which references a wrong pointer, sum_page, in

f2fs_gc. It was newly introduced in 4.9-rc1.
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Merge tag 'for-f2fs-4.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs bugfix from Jaegeuk Kim:
 "This fixes a bug which referenced the wrong pointer, sum_page, in
  f2fs_gc.  It was newly introduced in 4.9-rc1.

* tag 'for-f2fs-4.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs:
  f2fs: fix wrong sum_page pointer in f2fs_gc

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)));