Re: [PATCH 2.6.13 5/14] sas-class: sas_discover.c Discover process(end devices)

[James Bottomley]

On Tue, 2005-09-13 at 15:42 -0700, Patrick Mansfield wrote:
> So adding a W_LUN at this point does not add any value ... maybe it looks
> nice in the spec and in someones firmware, but it does not add anything
> that I can see.

Well I agree with the analysis, but even given that, we have a linux
implementation problem: We have to get an inquiry response first before
we begin a report luns scan.  An array implementing a W_LUN is entitled
not respond on LUN 0 to INQUIRY with an error, which would mean we don't
see it.

Therefore, I think our strategy has to be when the current probe fails
because of no LUN 0 try a report luns scan on the W_LUN anyway as long
as the transport indicates it is capable of supporting it (i.e. as long
as it has max_luns set at 0xffff or higher).

James


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