[PATCH v2] ext4: Fix ext4_error_err save negative errno into superblock

[Ye Bin]

As read_mmp_block return 1 when failed. read_mmp_block return -EIO when buffer
isn't uptodate.

Fixes: 54d3adbc29f0 ("ext4: save all error info in save_error_info() and
drop ext4_set_errno()")
Reported-by: Liu Zhi Qiang <liuzhiqian...@huawei.com>
Signed-off-by: Ye Bin <yebi...@huawei.com>
---
 fs/ext4/mmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/mmp.c b/fs/ext4/mmp.c
index 795c3ff2907c..68fbeedd627b 100644
--- a/fs/ext4/mmp.c
+++ b/fs/ext4/mmp.c
@@ -56,7 +56,7 @@ static int write_mmp_block(struct super_block *sb, struct 
buffer_head *bh)
        wait_on_buffer(bh);
        sb_end_write(sb);
        if (unlikely(!buffer_uptodate(bh)))
-               return 1;
+               return -EIO;
 
        return 0;
 }
-- 
2.25.4