Re: [PATCH] pci-dma: Fix x86 dma_alloc_coherent to fully clear all pages returned

From: Alan Stern
Date: Wed Feb 18 2015 - 15:45:37 EST

On Wed, 18 Feb 2015, Tim Chen wrote:

> > Have you tried doing the experiments I suggested in
> >
> >
> >
> > to determine where the problem occurs?
> >
> I was bogged down with other things lately and I haven't got a chance to
> test that. But as you said, there's very few places where xhci
> call this memory allocation. So I think the problem has been fairly
> narrowed down for the XHCI folks.

I disagree. _You_ reported the error. How can you expect other people
to figure out where it is with no help from you?

I looked briefly at the xhci-hcd DMA allocation code. It does not
contain any obvious mistakes.

Alan Stern

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