Re: [PATCH] make ps2 mouse work ...

[Jun Sun <jsun@mvista.com>]

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