From: Jeff Garzik <jgarzik@pobox.com>
To: James Bottomley <James.Bottomley@SteelEye.com>
Cc: David Caldwell <david@porkrind.org>, linux-scsi@vger.kernel.org
Subject: Re: [SCSI] Add support for braindead Cypress USB ATA passthrough CDBs
Date: Fri, 23 Dec 2005 12:41:09 -0500 [thread overview]
Message-ID: <43AC36B5.3000209@pobox.com> (raw)
In-Reply-To: <1135353160.3728.10.camel@mulgrave>
James Bottomley wrote:
> 1) Simply don't mangle the LUN for SCSI_UNKNOWN and then have all the
> subsystems lying about SCSI_2 compliance instead set their mangled level
> to SCSI_UNKNOWN (which seems to be more truthful)
It is specified in MMC that ATAPI or USB may be SCSI level to zero.
Thus "lying" is not really accurate at all. We need to update SCSI to
handle these devices as specified.
This is why I snoop INQUIRY for ATAPI devices in libata-scsi, and force
the SCSI version to 0x05, if SCSI version is returned from the device as
zero. It is conditional because -- due to the wonderful world of
hardware -- some ATAPI devices (such as SCSI devices plugged into an
SPI<->ATA bridge) and some USB devices correctly report SCSI version.
Jeff
next prev parent reply other threads:[~2005-12-23 17:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-21 12:24 [SCSI] Add support for braindead Cypress USB ATA passthrough CDBs David Caldwell
2005-12-22 9:24 ` thomas schorpp
2005-12-22 20:22 ` David Caldwell
2005-12-23 15:52 ` James Bottomley
2005-12-23 17:41 ` Jeff Garzik [this message]
2005-12-23 17:59 ` James Bottomley
2005-12-23 19:12 ` David Caldwell
2005-12-23 20:34 ` James Bottomley
2005-12-23 21:13 ` David Caldwell
2005-12-24 3:28 ` Douglas Gilbert
2005-12-24 7:11 ` David Caldwell
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