Re: [PATCH] (Longhaul 1/5) PCI: Protect bus master DMA from Longhaulby rw semaphores

[Jeremy Fitzhardinge]

Alan Cox wrote:
> I am still not clear if this is just cache corruption through us not
> listening or whether we genuinely need to halt.
Especially buggy steppings of C3s would stop snooping while in 'hlt', so 
it wouldn't surprise me if they stopped while doing a speed transition.

>  In the former case
> flushing and disabling the CPU caches ought to be sufficient.
>   
Sounds reasonable, unless that causes problems of its own.  (My general 
experience with Via CPUs is that doing anything even slightly unusual 
will result in strange behaviour or outright buggyness.)

   J
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