io_uring/msg_ring: fix missing lock on overflow for IOPOLL
If the target ring is configured with IOPOLL, then we always need to hold the target ring uring_lock before posting CQEs. We could just grab it unconditionally, but since we don't expect many target rings to be of this type, make grabbing the uring_lock conditional on the ring type. Link: https://lore.kernel.org/io-uring/Y8krlYa52%2F0YGqkg@ip-172-31-85-199.ec2.internal/Reported-by: Xingyuan Mo <hdthky0@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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