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

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Date:	Wed, 18 Feb 2015 15:45:31 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
cc:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, "H. Peter Anvin" <hpa@...or.com>,
	Akinobu Mita <akinobu.mita@...il.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	<linux-kernel@...r.kernel.org>, <x86@...nel.org>,
	<linux-usb@...r.kernel.org>, stable <stable@...r.kernel.org>
Subject: Re: [PATCH] pci-dma: Fix x86 dma_alloc_coherent to fully clear all
 pages returned

On Wed, 18 Feb 2015, Tim Chen wrote:

> > Have you tried doing the experiments I suggested in
> > 
> >         http://marc.info/?l=linux-usb&m=142272448620716&w=2
> > 
> > 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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