Re: [PATCH] Promise 'stex' driver

From: Jeff Garzik
Date: Thu Jul 20 2006 - 20:15:24 EST

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
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.


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