block: blk-throttle should be drained regardless of q->elevator

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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 <tj@kernel.org>
Reported-by: Vivek Goyal <vgoyal@redhat.com>

Fold in bug fix from Vivek.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

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Tejun Heo 2012-03-06 21:24:55 +01:00 • committed by Jens Axboe

parent ea5f4db8ec

commit b855b04a0b

1 changed files with 15 additions and 12 deletions

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block/blk-core.c

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