[sane-devel] linux-2.6.1-smp,usb,oops,sane-backends-1.0.13,epson-1640

[Henning Meier-Geinitz]

Hi,

On Sat, Jan 17, 2004 at 08:04:40PM +0000, Till Kamppeter wrote:
> Is there a way to block the usage of the scanner.o module by means of 
> the SAME package (compile-time config or so)?

No and that wouldn't help. When the kernel scanner driver is loaded,
it claims the USB devices it knows. libusb can't access them in this
case.

> Or is it the best to ask 
> our kernel maintainer to make a kernel package without scanner.o? Is it 
> safe to publish a distro (Mandrake Linux 10.0) without scanner.o in its 
> kernel? Would I loose compatibility for certain scanner models or not?

To my knowledge, every scanner that works with the scanner module also
works with libusb. But this is only true for SANE, I don't know if
it's the same for other software like vuescan.

If that's possible I would include the scanner driver, but not load it
by default. So if the user really needs it, he can load it. I have no
idea how to do that with hotplug, however.

> And does the oops only appear with the SMP kernel 2.6.x or also with the 
> standard kernel 2.6.x.

There seem to be two oopses (maybe related): One that happens on
unplugging a scanner. That one happens also without SMP and without
preemtible kernel.

The other one that seems to accour when a scanner is accessed (e.g.
scanimage -L) only occurs with preemption turned on. I haven't tested
SMP.

I can't reproduce any of the libusb problems but I use different
scanners.

Bye,
  Henning