io_uring: fix iopoll -EAGAIN handling

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req->iopoll() is not necessarily called by a task that submitted a
request. Because of that, it's dangerous to grab_env() and punt async on
-EGAIN, potentially grabbing another task's mm and corrupting its
memory.

Do resubmit from the submitter task context.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2020-06-28 12:52:38 +03:00 • committed by Jens Axboe

parent 3adfecaa64

commit f3a6fa2267

1 changed files with 4 additions and 7 deletions

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fs/io_uring.c

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