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block: blk-throttle should be drained regardless of q->elevator
Currently, blk_cleanup_queue() doesn't call elv_drain_elevator() if q->elevator doesn't exist; however, bio based drivers don't have elevator initialized but can still use blk-throttle. This patch moves q->elevator test inside blk_drain_queue() such that only elv_drain_elevator() is skipped if !q->elevator. -v2: loop can have registered queue which has NULL request_fn. Make sure we don't call into __blk_run_queue() in such cases. Signed-off-by: Tejun Heo <[email protected]> Reported-by: Vivek Goyal <[email protected]> Fold in bug fix from Vivek. Signed-off-by: Jens Axboe <[email protected]>
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