[cpia] USB/SMP lockups

[Arjan van de Ven]

In article <200007291714.NAA02722@blanch.math.uwaterloo.ca> you wrote:

> I've been getting major lockups (sysrq doesn't work) when
> using my EZonics EZcam with an SMP-enabled kernel.  Switching
> down to UP seems to not cause any lockups.

> My system is a dual Abit Bp6, 224mb, linux-2.4.0-test5.

There are 2 things that cause a crash for you:

1) The cpia driver in 2.4.0-test5 does corrupt memory (fixed in the
   sourceforge version)
2) The USB stack in 2.4.0-testX has a very ugly race that is _very_
   repeatable. I have informed the usb maintainer about this, but so far
   there has not been a fix

Greetings,
   Arjan van de Ven