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io_uring: pin ctx on fallback execution

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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: 9011bf9a13 ("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>
This commit is contained in:
Pavel Begunkov 2021-08-17 22:36:44 +01:00 committed by Jens Axboe
parent 21f965221e
commit 9cb0073b30
1 changed files with 2 additions and 0 deletions
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2
fs/io_uring.c
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@ -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,