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 12:36:54 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	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, Feb 18, 2015 at 12:19:03PM -0800, Tim Chen wrote:
> On Wed, 2015-02-18 at 14:53 -0500, Alan Stern wrote:
> > On Wed, 18 Feb 2015, Tim Chen wrote:
> > 
> > > On Wed, 2015-02-04 at 10:30 -0800, Tim Chen wrote:
> > > > On Mon, 2015-02-02 at 19:39 +0300, Sergei Shtylyov wrote:
> > > > 
> > > > > 
> > > > > > Hi, is this an open-coded version of PAGE_ALIGN?
> > > > > 
> > > > >     Yes, it appears so. :-)
> > > > > 
> > > > > WBR, Sergei
> > > > > 
> > > > 
> > > > Thanks for the suggestion by Jiri. I updated the patch to use PAGE_ALIGN
> > > > below.
> > > > 
> > > > Regards,
> > > > Tim
> > > > 
> > > 
> > > Is there any resolution on this patch?  I haven't seen fixes from the
> > > XHCI folks yet.  This is breaking many of our systems.
> > 
> > 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.

The "XHCI folks" are in a cube near you, go poke them in person if they
aren't answering their emails :)

good luck,

greg k-h
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