Re: [gentoo-desktop] Kernel_2.6/devfsd/SCSI/USB/Digital Camera problem

[Collins Richey]

On Sat, 16 Oct 2004 22:23:10 -0500, Lindsay Haisley
<fmouse-gentoo@×××.com> wrote:

> I have a digital camera which connects to my Linux desktop system via a USB
> port.  Under kernel 2.4.20-r9, when the camera is connected, devfsd creates
> /dev/scsi/host4 (there is already a valid host1, host2 and host3).
> /dev/scsi/host4/bus0/target0/lun0/part1 is the CF card in the camera, and
> can be read as a FAT filesystem drive.  When the camera is turned off and
> disconnected, the file heirarchy under /scsi/host4 remains there, except for
> part1, the actual CF card.
>
> With kernel 2.6.8-r10 the situation is fubar.  Each time the camera is
> turned off and on, another file heirarchy is created under /dev/scsi for the
> camera, and the previous /scsi/host* trees created when the camera was
> connected previously remain, but contain no devices.

A perfectly valid question.

I can't explain the behavior for devfs, but you should be able to cure
the problem by moving over to udev. You can add a udev paramter to
insure that the camera always mounts as some specific device, example
/dev/sda?. udev does not use the complex
/dev/scsi/host4/bus0/target0/lun0/part? nomenclature.

Some devfs guru may be able to help you, but if it's a bug, you're
sol. devfs has been deprecated. You'll be better off making the effort
to get udev/coldplug up and running. There are a few little wrinkles
with nvidia and sound cards, but all in all udev is sweet. There's a
gentoo udev howto and lots of info on forums.

HTH,

-- 
 /\/\
(CR) Collins Richey
 \/\/        "I hear you're single again." "Spouse 2.0 had fewer bugs than
              Spouse 1.0, but the maintenance ... was too much for my OS."
                  - Glitch (tm)

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