Re: [PATCH 12/19] blk-mq: Initialize a request before assigning a tag

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On Sun, 2017-05-28 at 10:42 +0200, Christoph Hellwig wrote:
> On Thu, May 25, 2017 at 11:43:20AM -0700, Bart Van Assche wrote:
> > Initialization of blk-mq requests is a bit weird: blk_mq_rq_ctx_init()
> > is called after a tag has been assigned and .rq_flags is initialized
> > in __blk_mq_finish_request().
> > 
> > Call blk_mq_rq_ctx_init() before
> > modifying any struct request members. Initialize .rq_flags in
> > blk_mq_rq_ctx_init() instead of in __blk_mq_finish_request(). This
> > patch does not change the behavior of the block layer.
> 
> One things this patch does is to initialize the tag value actually
> set twice.  In general this looks ok, but I can't really see the real
> value.

Hello Christoph,

If you want I can leave out the changes to the .tag / .internal_tag
assignments from this patch.

Bart.




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