[ 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 --- fs/io_uring.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c index 5eaf3a7badcc..3c9bb7673da5 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2084,6 +2084,9 @@ static void __io_req_task_submit(struct io_kiocb *req) 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)