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io_uring: don't fail iopoll requeue without ->mm 

Actually, io_iopoll_queue() may have NULL ->mm, that's if SQ thread
didn't grabbed mm before doing iopoll. Don't fail reqs there, as after
recent changes it won't be punted directly but rather through task_work.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-30 15:20:40 +03:00 committed by Jens Axboe
parent ab0b6451db
commit cf2f54255d
1 changed files with 1 additions and 3 deletions
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4
fs/io_uring.c
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@ -1902,9 +1902,7 @@ static void io_iopoll_queue(struct list_head *again)
do {
req = list_first_entry(again, struct io_kiocb, list);
list_del(&req->list);
/* should have ->mm unless io_uring is dying, kill reqs then */
if (unlikely(!current->mm) || !io_rw_reissue(req, -EAGAIN))
if (!io_rw_reissue(req, -EAGAIN))
io_complete_rw_common(&req->rw.kiocb, -EAGAIN, NULL);
} while (!list_empty(again));
}