loop: Only freeze block queue when needed.
__loop_update_dio() can be called as a part of loop_set_fd(), when the block queue is not yet up and running; avoid freezing the block queue in that case, since that is an expensive operation. Reviewed-by:Christoph Hellwig <hch@lst.de> Reviewed-by:
Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Signed-off-by:
Martijn Coenen <maco@android.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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