On Fri, 2015-01-30 at 11:58 -0800, Greg KH wrote:
>
> Shouldn't this go to stable trees too?
>
Yes. Added the stable tag in updated patch that's resent.
> Also, why is the xhci driver not asking for the memory it is going to
> need? If it wants to use the full page, shouldn't it ask for it?
>
I agree that xhci should have done that, but it didn't. Commit
d92ef66c4f8f ("x86: make dma_alloc_coherent() return zeroed memory
if CMA is enabled") changed the behavior of dma_alloc_coherent
by clearing only the memory being asked for.
So for backward compatibility, clearing the pages
completely to revert to dma_alloc_coherent's original
behavior is probably the safe thing to do.
Thanks.
Tim
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