[9273] in linux-scsi channel archive
Re: Problem w/ recent scsi_scan changes
daemon@ATHENA.MIT.EDU (Alan Cox)
Mon Jul 31 08:25:31 2000
To: sralston@ra.ks.lsil.com (Steve Ralston)
Date: Mon, 31 Jul 2000 13:18:51 +0100 (BST)
Cc: linux-scsi@vger.rutgers.edu (linux-scsi)
In-Reply-To: <200007311030.FAA28068@ra.ks.lsil.com> from "Steve Ralston" at Jul 31, 2000 11:27:02 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
> We're having a problem with recent (linux-2.4.0-test2) scsi_scan.c,
> centered around this change:
> /*
> * We used to do a TEST_UNIT_READY before the INQUIRY but that was
> * not really necessary. Spec recommends using INQUIRY to scan for
> * devices (and TEST_UNIT_READY to poll for media change). - Paul G.
This change is correct.
> We have a RAID subsystem that happens to return (e.g.):
> SCSI Error Report =-=-= (ioc0,scsi0:4)
> SCSI_Status=02h (CHECK CONDITION)
> Original_CDB[]: 00 80 00 00 00 00 - "TEST UNIT READY"
> SenseData[A0h]: 70 00 05 00 00 00 00 98 00 00 00 00 25 00 00 00 00 00 ...
> SenseKey=5h (ILLEGAL REQUEST); FRU=00h
> ASC/ASCQ=25h/00h "LOGICAL UNIT NOT SUPPORTED"
> to TEST_UNIT_READY (and READ_CAPACITY, et al), which *used* to cause linux
> to ignore the LUN.
>
> We kindly request that TEST_UNIT_READY *before* INQUIRY be reinstated.
That breaks some standards compliant subsystems. Probably what needs to be done
is to accept logical-unit-not-supported from a TUR as meaning we guessed wrongly
Alan
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