linux-kernel - Re: [PATCH] io_uring: fix ctx refcounting in io_submit

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Message-ID: <c6da3fdd-541c-ba20-ec7a-6acd2ce9c3cd@kernel.dk>
Date:   Sun, 5 Apr 2020 15:24:09 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io_uring: fix ctx refcounting in io_submit_sqes()

On 4/5/20 3:08 PM, Pavel Begunkov wrote:
> If io_get_req() fails, it drops a ref. Then, awhile keeping @submitted
> unmodified, io_submit_sqes() breaks the loop and puts @nr - @submitted
> refs. For each submitted req a ref is dropped in io_put_req() and
> friends. So, for @nr taken refs there will be
> (@nr - @submitted + @submitted + 1) dropped.
> 
> Remove ctx refcounting from io_get_req(), that at the same time makes
> it clearer.

Applied, but also marked for 5.6 stable.

-- 
Jens Axboe