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

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Message-ID: <Pine.LNX.4.44L0.1502181451530.1245-100000@iolanthe.rowland.org>
Date:	Wed, 18 Feb 2015 14:53:03 -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:

> 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?

Alan Stern

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