Date: Mon, 06 Mar 2000 13:25:45 -0800 From: Mike Smith <msmith@freebsd.org> To: mjacob@feral.com Cc: Nick Hibma <n_hibma@calcaphon.com>, FreeBSD SCSI Mailing List <scsi@FreeBSD.ORG> Subject: Re: first INQUIRY goes round in circles (fwd) Message-ID: <200003062125.NAA00633@mass.cdrom.com> In-Reply-To: Your message of "Mon, 06 Mar 2000 08:17:40 PST." <Pine.BSF.4.05.10003060816190.74886-100000@semuta.feral.com>
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This sounds an awful lot like what's happening with this stupid Spectra
changer, actually. 8(
> Test Unit Ready is mandatory, and that SCSI Floppy is sure busted, but I'm
> very nervous about this change. If people agree that it should be adopted,
> let's really wait until after 4.0 is cut, okay?
>
>
> >
> > The very first command issued by XPT, INQUIRY, goes round in circles if
> > a drive chooses to not reset a Unit Attention (UA) error. It retries the
> > INQUIRY command indefinitely (I have no idea why, but my gut feeling is
> > that somewhere a new INQUIRY command is issued to get some sensible
> > info from the drive, which then ends up in a loop)
> >
> >
> > The UFI (SCSI derivative) USB device (Y-E Data Flashbuster-U floppy
> > drive) I have here is broken as it INQUIRY - REQUEST SENSE - INQUIRY
> > returns the same sense code (sense key = 0x06, asc = 0x29, ascq = 0x00)
> > again at the second INQUIRY command, because the INQUIRY does not clear
> > the UA state.
> >
> > As this is the very first command tried, it is impossible to use a
> > device specific quirk.
> >
> > I suggest the following patch. It might have the following problems:
> >
> > - Test Unit Ready not supported by some devices
> > - Devices reporting more than 4 UA states (4 is the number of retries
> > in scsi_inquiry)
> >
> > Let me know.
> >
> > Nick
> >
> >
> >
> > ===================================================================
> > RCS file: /home/ncvs/src/sys/cam/scsi/scsi_all.c,v
> > retrieving revision 1.14
> > diff -u -r1.14 scsi_all.c
> > --- scsi/scsi_all.c 2000/02/20 04:42:43 1.14
> > +++ scsi/scsi_all.c 2000/03/06 12:11:29
> > @@ -1045,7 +1045,7 @@
> > "Not ready to ready change, medium may have changed") },
> > /* DT WR OM */{SST(0x28, 0x01, SS_DEF,
> > "Import or export element accessed") },
> > -/* DTLPWRSOMCAE */{SST(0x29, 0x00, SS_NEDEF|ENXIO,
> > +/* DTLPWRSOMCAE */{SST(0x29, 0x00, SS_TUR|SSQ_DECREMENT_COUNT|ENXIO,
> > "Power on, reset, or bus device reset occurred") },
> > /* DTLPWRSOMCAE */{SST(0x29, 0x01, SS_DEF,
> > "Power on occurred") },
> >
> > --
> > n_hibma@webweaving.org
> > n_hibma@freebsd.org USB project
> > http://www.etla.net/~n_hibma/
> >
> >
> >
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-scsi" in the body of the message
> >
>
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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>
--
\\ Give a man a fish, and you feed him for a day. \\ Mike Smith
\\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org
\\ and he'll hate you for a lifetime. \\ msmith@cdrom.com
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