Re: snapscan / Agfa 1236s hangs scsi/aic7xxx until reset and a fix

From: Henrik Johansson (henrikjo@post.utfors.se)
Date: Wed Feb 23 2000 - 01:12:34 PST

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    On Wed, 23 Feb 2000, you wrote:
    > Hello.
    >
    > I'm using an Agfa 1236S with the snapscan backend (src-1.0.tar.gz).
    > Scanimage (for example) doesn't work and left the computer in a funny
    > state. Actually, the driver hangs, and since I've only SCSI disks,
    > everything slowly blocks as disks are solicited. The kernel log shows
    > that requests to disks (on the same scsi card) timeout.

    > The problem can be traced back to the piece of code requesting scanner
    > self-test. I just commented out that portion (diff -u included at the
    > end of this message) and everything works fine. I believe the problem
    > to be actually in the generic SCSI driver (that shouldn't crash so
    > badly whatever trash may be sent to it), however this is a workaround.

    That's interesting. I've got reports from Snapscan 1212U owners about USB-bus
    lockups when using my patched snapscan backend. The problem was traced to
    the self-test command. After filtering out this command in the USB
    command sending routines the scanner has worked perfectly.

    Henrik

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