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

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Message-ID: <1424290743.9530.122.camel@schen9-desk2.jf.intel.com>
Date:	Wed, 18 Feb 2015 12:19:03 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Alan Stern <stern@...land.harvard.edu>
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, 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.

Tim

> Alan Stern
> 


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