[PATCH] EHCI Oops on CONFIG_NOT_COHERENT_CACHE system
marcus at mc.pp.se
Thu Aug 31 03:42:31 EST 2006
Milton Miller <miltonm at bga.com> writes:
> I think its a case of the people that know the architecture agree
> that atomics and DMA do not mix, and that this is an issue for
> usb-devel to fix.
That was precisely the kind of agreement I was looking for. :-)
> The other question is: does the current access polute the cache by
> reading things where the device is supposed to be writing?
Well, that shouldn't be an issue as the page is cache-inhibited.
And on systems with cache coherency, where the pages are not cache-
inhibited, this would be handled by bus snooping, right?
> My suggestion is take the issue over there, and only cc us here if
> you get pushback over there.
Ok, will do. Thanks.
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