Re: wrong SP restored after DBE exception

[Dave Johnson <djohnson+linux-mips@sw.starentnetworks.com>,]

Ralf Baechle writes:
> I would suggest to disable interrupts around accesses that potencially
> could result in DB exceptions and just to make sure he is not getting
> trapped by a non-blocking load by making some use of any value read
> from the device.  Writes could be posted depending on bus type.  So
> having a read from the same device would force the write to complete.
> 
>   Ralf

Ya, I was about to try that.  I could be getting an interrupt
between the time the read is issued and the timeout occurs on the
GBus.  Also, doing a dummy read on the GBus to a device that
shouldn't fault prior to (for reads) or after (for writes) the
potentially faulting one to force ordering seems like a good idea
too.


-- 
Dave Johnson
Starent Networks