[7743] in linux-scsi channel archive
Re: SCSI queueing status.
daemon@ATHENA.MIT.EDU (Tim Waugh)
Thu Dec 23 09:17:42 1999
Date: Thu, 23 Dec 1999 12:48:09 +0000 (GMT)
From: Tim Waugh <twaugh@redhat.com>
To: Eric Youngdale <eric@andante.org>
Cc: linux-scsi@vger.rutgers.edu, Peter Rival <frival@zk3.dec.com>,
Christoph Rohland <hans-christoph.rohland@sap.com>,
frankeh@us.ibm.com
In-Reply-To: <003c01bf4cdd$f9407e20$7f66420c@zydeco>
Message-ID: <Pine.LNX.4.10.9912231244020.1242-100000@twaugh.surrey.redhat.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
On Thu, 23 Dec 1999, Eric Youngdale wrote:
> 2) Some people were reporting problems scanning the bus with ppa and
> imm host adapters. The problem here was that I was incrementing the
> host usage count too soon, and thus hosts that could only queue a
> single command would deadlock attempting to scan the bus. I think I
> have fixed this - it was a relic of the old way of doing things (and a
> maintainence problem as well) to bump the usage count in two separate
> functions. I moved this over so that it is all done in the same place
> now. There is a danger that I missed something here, and thus there
> is a slight possibility that usage counts will get out of synch and
> the system will wedge.
Eric, I'm still having trouble with ppa after this patch. It gets further
now -- the ppa module initialises now -- but I don't end up with a SCSI
device. Here's the syslog from 2.3.35+your patch:
ppa: Version 2.03 (for Linux 2.2.x)
ppa: Found device at ID 6, Attempting to use EPP 32 bit
ppa: Found device at ID 6, Attempting to use PS/2
ppa: Communication established with ID 6 using PS/2
scsi0 : Iomega VPI0 (ppa) interface
scsi : 1 host.
Vendor: IOMEGA Model: ZIP 100 Rev: D.09
Type: Direct-Access ANSI SCSI revision: 02
And here's the syslog from 2.2.14pre16:
ppa: Version 2.03 (for Linux 2.2.x)
ppa: Found device at ID 6, Attempting to use EPP 32 bit
ppa: Found device at ID 6, Attempting to use PS/2
ppa: Communication established with ID 6 using PS/2
scsi0 : Iomega VPI0 (ppa) interface
scsi : 1 host.
Vendor: IOMEGA Model: ZIP 100 Rev: D.09
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi removable disk sda at scsi0, channel 0, id 6, lun 0
SCSI device sda: hdwr sector= 512 bytes. Sectors= 196608 [96 MB] [0.1 GB]
sda: Write Protect is off
sda: sda4
Is this the 'wedge' that you mentioned?
Tim.
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