diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-08-17 22:36:44 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-17 16:06:14 -0600 |
| commit | 9cb0073b302a6b8a8c1015ff31b2b3ab4900f866 (patch) | |
| tree | 9bdbfa1fa00c665de564148b5457918922c6b664 /fs/io_uring.c | |
| parent | 21f965221e7c42609521342403e8fb91b8b3e76e (diff) | |
io_uring: pin ctx on fallback execution
Pin ring in io_fallback_req_func() by briefly elevating ctx->refs in
case any task_work handler touches ctx after releasing a request.
Fixes: 9011bf9a13e3b ("io_uring: fix stuck fallback reqs")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/833a494713d235ec144284a9bbfe418df4f6b61c.1629235576.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
| -rw-r--r-- | fs/io_uring.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 6a092a534d2b..979941bcd15a 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2477,8 +2477,10 @@ static void io_fallback_req_func(struct work_struct *work) struct llist_node *node = llist_del_all(&ctx->fallback_llist); struct io_kiocb *req, *tmp; + percpu_ref_get(&ctx->refs); llist_for_each_entry_safe(req, tmp, node, io_task_work.fallback_node) req->io_task_work.func(req); + percpu_ref_put(&ctx->refs); } static void __io_complete_rw(struct io_kiocb *req, long res, long res2, |