io_uring: fix counter inc/dec mismatch in async_list
authorZhengyuan Liu <liuzhengyuan@kylinos.cn>
Tue, 16 Jul 2019 15:26:14 +0000 (23:26 +0800)
committerJens Axboe <axboe@kernel.dk>
Tue, 16 Jul 2019 15:55:14 +0000 (09:55 -0600)
commitf7b76ac9d17e16e44feebb6d2749fec92bfd6dd4
treec6e4e4fbe2f5371efe16be1fab18f69adfb6fff3
parentc56cbfae62b7d572c7994c927202d337633cc7d9
io_uring: fix counter inc/dec mismatch in async_list

We could queue a work for each req in defer and link list without
increasing async_list->cnt, so we shouldn't decrease it while exiting
from workqueue as well if we didn't process the req in async list.

Thanks to Jens Axboe <axboe@kernel.dk> for his guidance.

Fixes: 31b515106428 ("io_uring: allow workqueue item to handle multiple buffered requests")
Signed-off-by: Zhengyuan Liu <liuzhengyuan@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
fs/io_uring.c