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io_uring: pin ctx on fallback execution
author
Pavel Begunkov
<asml.silence@gmail.com>
Tue, 17 Aug 2021 21:36:44 +0000
(22:36 +0100)
committer
Jens Axboe
<axboe@kernel.dk>
Tue, 17 Aug 2021 22:06:14 +0000
(16:06 -0600)
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>
fs/io_uring.c
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diff --git
a/fs/io_uring.c
b/fs/io_uring.c
index
6a092a5
..
979941b
100644
(file)
--- 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,