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Subjectusb-uhci + SMP -> bad
On Tue, Aug 14, 2001 at 01:48:06PM +0100, Alan Cox wrote:

> > - use the uhci USB driver when I'm using a USB printer. If I
> > use the usb-uhci driver with my USB printer, the whole system
> > locks. This has been reported a few times on LKML,
> > linux-usb-users, and linux-usb-developers and nobody helped,
> > but a few people wrote back with "me too"s. It was broken in
> > the trasnition from 2.4.3 to 2.4.4 and only seems to affect
> > SMP systems. I just gave up on USB printing and went back to
> > my parallel port.
> usb-uhci seems to not be SMP safe. Ultimately we don't need both uhci
> drivers so that hasnt been one that worried me. Probably we should drop
> the other uhci driver over time (2.5 maybe)

i'd just thought i'd verify that usb-uchi seems to be causing
some havoc on SMP boxes.

i've had complete crashes (Alt-SysRq-s doesn't respond) when i
try to print stuff to a USB printer using the usb-uchi and
printer modules. this is on an SMP box.

however -- 2.4.2 works perfectly for that. it broke from 2.4.4
onward (tried 2.4.[5-7], i'm presuming .8 hasn't fixed the

if anybody wants me to help them diagnose the problem, i'd be
more than happy to, but i'm not sure where to start at the

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