[PATCH 3/3] f2fs: prevent waiter encountering incorrect discard states

[Chao Yu]

In f2fs_submit_discard_endio, we will wake up waiter before setting
discard command states, so waiter may use incorrect states. Change
the order between complete() and states setting to fix this issue.

Signed-off-by: Chao Yu <yuch...@huawei.com>
---
 fs/f2fs/segment.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 57a81f9c8c14..9f9542c9fe47 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -717,9 +717,9 @@ static void f2fs_submit_discard_endio(struct bio *bio)
 {
        struct discard_cmd *dc = (struct discard_cmd *)bio->bi_private;
 
-       complete(&dc->wait);
        dc->error = bio->bi_error;
        dc->state = D_DONE;
+       complete(&dc->wait);
        bio_put(bio);
 }
 
-- 
2.8.2.295.g3f1c1d0