[PATCH AUTOSEL 5.2 192/249] bcache: fix return value error in bch_journal_read()

[Sasha Levin]

From: Coly Li <colyli@xxxxxxx>

[ Upstream commit 0ae49cb7aa005ed18fe8f4d6ccf73019b78ac7b2 ]

When everything is OK in bch_journal_read(), finally the return value
is returned by,
	return ret;
which assumes ret will be 0 here. This assumption is wrong when all
journal buckets as are full and filled with valid journal entries. In
such cache the last location referencess read_bucket() sets 'ret' to
1, which means new jset added into jset list. The jset list is list
'journal' in caller run_cache_set().

Return 1 to run_cache_set() means something wrong and the cache set
won't start, but indeed everything is OK.

This patch changes the line at end of bch_journal_read() to directly
return 0 since everything if verything is good. Then a bogus error
is fixed.

Signed-off-by: Coly Li <colyli@xxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/md/bcache/journal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 12dae9348147..4e5fc05720fc 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -268,7 +268,7 @@ int bch_journal_read(struct cache_set *c, struct list_head *list)
 					    struct journal_replay,
 					    list)->j.seq;
 
-	return ret;
+	return 0;
 #undef read_bucket
 }
 
-- 
2.20.1