Re: [PATCH] Promise 'stex' driver

Jeff Garzik
2006-07-21T00:16:27Z

James Bottomley wrote:
> On Thu, 2006-07-20 at 17:27 -0400, Jeff Garzik wrote:
>> Since _no individual SCSI driver_ uses the block layer
>> tagging, it is likely that some instability and core kernel
>> development
>> will occur, in order to make that work.
>
> That's not quite true: 53c700 and tmscsim both use it ... I could with
> the usage were wider, but at least 53c700 has pretty regular and
> constant usage ... enough I think to validate the block tag code (it's
> been using it for the last three years).

Not for the case being discussed in this thread, adapter-wide tags.

AFAICS, no file in include/scsi/* or drivers/scsi/* ever calls
blk_queue_init_tags() with a non-NULL third arg.

The block tagging capability being discussed here is poorly validated
due to overall underuse, and its never been used in SCSI AFAIK.

Jeff