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SubjectRe: [PATCH] make ps2 mouse work ...
On Wed, Jun 16, 2004 at 02:11:49PM +0200, Vojtech Pavlik wrote:
> On Tue, Jun 15, 2004 at 08:56:11PM -0700, Andrew Morton wrote:
>
> > > I found this problem on a MIPS machine. The problem is
> > > likely to happen on other register-rich RISC arches too.
> > >
> > > cmdcnt needs to be volatile since it is modified by
> > > irq routine and read by normal process context.
> >
> > volatile is not the preferred way to fix this up. This points at either a
> > locking error in the psmouse driver or a missing "memory" thingy in the
> > mips port somewhere.
> >
> > Please describe the bug which led to this patch. Where was it getting stuck?
>
> My current BK tree has this fixed using atomic bitfields, which do
> compilation and memory barriers. I plan to sync it to Linus post 2.6.7.
>

Can you post the patch here? I am sure many people are eagerly waiting
for the right fix. Plus there will be extra pairs of eyes to exam the fix.

Jun
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