| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 16/54] io_uring: drop mm/files between task_work_submit | Date | Thu, 11 Feb 2021 16:02:00 +0100 |
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From: Pavel Begunkov <asml.silence@gmail.com>
[ Upstream commit aec18a57edad562d620f7d19016de1fc0cc2208c ]
Since SQPOLL task can be shared and so task_work entries can be a mix of them, we need to drop mm and files before trying to issue next request.
Cc: stable@vger.kernel.org # 5.10+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- fs/io_uring.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2084,6 +2084,9 @@ static void __io_req_task_submit(struct else __io_req_task_cancel(req, -EFAULT); mutex_unlock(&ctx->uring_lock); + + if (ctx->flags & IORING_SETUP_SQPOLL) + io_sq_thread_drop_mm(); } static void io_req_task_submit(struct callback_head *cb)
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