Re: [PATCH 1/3] blk-mq: add non_owner variant of start_freeze/unfreeze queue APIs

[Christoph Hellwig]

> +/*
> + * non_owner variant of blk_freeze_queue_start
> + *
> + * The queue needn't to be unfreeze in current task, and non-owner use is
> + * fragile and easy to cause race, please try your best to avoid it

Maybe say:

 Unlike blk_freeze_queue_start, the queue doesn't need to be unfrozen
 by the same task.  This is fragile and should not be used if at all
 possible.

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>