Date: Mon, 6 Mar 2000 15:47:21 +0000 (GMT) From: Nick Hibma <n_hibma@calcaphon.com> To: FreeBSD SCSI Mailing List <scsi@FreeBSD.org> Subject: first INQUIRY goes round in circles (fwd) Message-ID: <Pine.BSF.4.20.0003061546430.345-100000@localhost>
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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/
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