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blk-mq: clarify blk_mq_quiesce_queue_nowait() comment #918

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blk-mq: clarify blk_mq_quiesce_queue_nowait() comment #918

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10 changes: 8 additions & 2 deletions block/blk-mq.c
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Original file line number Diff line number Diff line change
Expand Up @@ -255,8 +255,14 @@ void blk_mq_unfreeze_queue_non_owner(struct request_queue *q)
EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue_non_owner);

/*
* FIXME: replace the scsi_internal_device_*block_nowait() calls in the
* mpt3sas driver such that this function can be removed.
* Mark a request queue as quiesced without waiting for in-flight dispatches
* to finish. Callers that need to ensure dispatch has drained must follow
* this with blk_mq_wait_quiesce_done() on the queue's tag_set, or use
* blk_mq_quiesce_queue() which combines both steps.
*
* This split exists so multiple queues (e.g. all LUNs on a SCSI host, or all
* queues in a tag_set) can be quiesced without sleeping per queue, then
* waited on once at tag_set scope.
*/
void blk_mq_quiesce_queue_nowait(struct request_queue *q)
{
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