On Fri, 26 Mar 2004, Matthias Andree wrote:
> So can the initialization sequence be run after "babble" was detected on
> a VIA controller that locked up?
I'm not sure what initialization you're referring to. After a VIA
controller has locked up, _nothing_ can be done with it, other than
completely resetting it. That's what the UHCI driver does when it is
first loaded, and that's why rmmod/modprobe uhci-hcd will get the
controller going again.
> > It's a separate problem. Take my advice, just avoid all these
> > difficulties by not running usbmodules.
>
> I understand that usbmodules is the trigger and a newer version will not
> cause these problems. But as long as *any* user space is able to kill
> the kernel or shut devices off, requiring reloading modules, the issue
> isn't solved. Given that some people always rattle the cage of "remove
> module unloading", this issue _must_ be fixed. Requiring to reload a
> module is not a solution.
It isn't a single issue, it's a confluence of several problems.
VIA controllers have this flaw that makes them stop when they
receive a packet longer than they expect. It's a genuine
error in the hardware (unless it was done deliberately (?) )
and at the moment we don't have a workaround for it. If you
can suggest a way to solve this problem I would be very glad
to hear it.
Your scanner gets confused when it receives too many requests
too quickly. It doesn't answer them properly and it sends
replies that are longer than they should be. That's a genuine
error in the scanner's firmware, and it can't be fixed by
messing around with the Linux kernel.
Access control in usbfs doesn't work well. In fact, you can't
even mount the filesystem with 0666 permissions, so you have
to be root to write to any of the device files. Eventually
this will be fixed, but not for quite some time.
Alan Stern
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