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io_uring: pin context while queueing deferred tw 

Unlike normal tw, nothing prevents deferred tw to be executed right
after an tw item added to ->work_llist in io_req_local_work_add(). For
instance, the waiting task may get waken up by CQ posting or a normal
tw. Thus we need to pin the ring for the rest of io_req_local_work_add()

Cc: stable@vger.kernel.org
Fixes: c0e0d6ba25 ("io_uring: add IORING_SETUP_DEFER_TASKRUN")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1a79362b9c10b8523ef70b061d96523650a23344.1672795998.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2023-01-04 01:34:02 +00:00 committed by Jens Axboe
parent af82425c6a
commit 9ffa13ff78
1 changed files with 7 additions and 1 deletions
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8
io_uring/io_uring.c
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@ -1236,13 +1236,18 @@ static void io_req_local_work_add(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
if (!llist_add(&req->io_task_work.node, &ctx->work_llist))
percpu_ref_get(&ctx->refs);
if (!llist_add(&req->io_task_work.node, &ctx->work_llist)) {
percpu_ref_put(&ctx->refs);
return;
}
/* need it for the following io_cqring_wake() */
smp_mb__after_atomic();
if (unlikely(atomic_read(&req->task->io_uring->in_idle))) {
io_move_task_work_from_local(ctx);
percpu_ref_put(&ctx->refs);
return;
}
@ -1252,6 +1257,7 @@ static void io_req_local_work_add(struct io_kiocb *req)
if (ctx->has_evfd)
io_eventfd_signal(ctx);
__io_cqring_wake(ctx);
percpu_ref_put(&ctx->refs);
}
void __io_req_task_work_add(struct io_kiocb *req, bool allow_local)