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io_uring: don't prepare DRAIN reqs twice

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If req->io is not NULL, it's already prepared. Don't do it again,
it's dangerous.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-05-17 14:02:11 +03:00 committed by Jens Axboe
parent 583863ed91
commit 650b548129
1 changed files with 7 additions and 6 deletions
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13
fs/io_uring.c
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@ -5014,12 +5014,13 @@ static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (!req_need_defer(req) && list_empty_careful(&ctx->defer_list))
return 0;
if (!req->io && io_alloc_async_ctx(req))
return -EAGAIN;
ret = io_req_defer_prep(req, sqe);
if (ret < 0)
return ret;
if (!req->io) {
if (io_alloc_async_ctx(req))
return -EAGAIN;
ret = io_req_defer_prep(req, sqe);
if (ret < 0)
return ret;
}
spin_lock_irq(&ctx->completion_lock);
if (!req_need_defer(req) && list_empty(&ctx->defer_list)) {