[9339] in linux-scsi channel archive
Re: add-single-device bizarreness
daemon@ATHENA.MIT.EDU (Marc SCHAEFER)
Wed Aug 9 17:28:33 2000
To: linux-scsi@vger.rutgers.edu
From: Marc SCHAEFER <schaefer@alphanet.ch>
Date: 9 Aug 2000 23:03:10 +0200
Message-ID: <8msgue$vv8$1@vulcan.alphanet.ch>
Eddie Williams <Eddie.Williams@SteelEye.com> wrote:
> What problem is trying to be solved with the Bus Device Reset?
Ensure that the drive is not in a bizarre negociated speed.
Example:
host negociates ultra-wide with disk
disk is disconnected from bus, but not powered down
bus is reset for some reason
disk is reconnected, still think ultra-wide is the norm
host does inquiry (*)
disk hangs
(*) if the first command does a new negociation, then it's not a problem.
I agree that this is a rare situation.
But today, it looks like in some cases the backwards situation can arise:
the kernel seems to think the device is in ultra wide just after
add-single-device. If the device was powered down, well, ...
My idea with the Bus Device Reset was to force the host adapter
to understand that he has to redo its negociation, since I don't
think you can tell him that another way.
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