Re: [PATCH] EHCI Oops on CONFIG_NOT_COHERENT_CACHE system

Milton Miller [off-list ref] 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.


  // Marcus