[dm-devel] [PATCH V3] blk-mq: introduce BLK_STS_DEV_RESOURCE

[Bart Van Assche]

On Tue, 2018-01-30 at 11:31 +0800, Ming Lei wrote:
> Please take a look at drivers, when BLK_STS_RESOURCE is returned, who
> will call blk_mq_delay_run_hw_queue() for drivers?

As you know the SCSI and dm drivers in kernel v4.15 already call that function
whenever necessary.

> > 
> > > [ ... ] Later, you admitted you understood the patch wrong. [ ... ]
> > 
> > That's nonsense. I never wrote that.
> 
> Believe it or not, follows the link and your reply:
> 
> 	https://marc.info/?l=dm-devel&m=151672694508389&w=2
> 
> > So what is wrong with this way?
> > Sorry, I swapped BLK_STS_DEV_RESOURCE and BLK_STS_RESOURCE accidentally in my
> > reply. What I meant is that changing a blk_mq_delay_run_hw_queue() call followed
> > by return BLK_STS_RESOURCE into BLK_STS_DEV_RESOURCE is wrong and introduces a
> > race condition in code where there was no race condition.

That meant that I made a mistake (typo) while typing the reply and nothing else.

Bart.