linux-kernel - Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7 overlapping mappings of pfn 55ebe

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Message-ID: <20140213201628.GA26303@redhat.com>
Date:	Thu, 13 Feb 2014 15:16:28 -0500
From:	Dave Jones <davej@...hat.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Sander Eikelenboom <linux@...elenboom.it>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Francois Romieu <romieu@...zoreil.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 3.14-mw regression: rtl8169 WARNING: DMA-API: exceeded 7
 overlapping mappings of pfn 55ebe

On Tue, Feb 11, 2014 at 06:07:10PM -0800, Dan Williams wrote:

 > The overlap granularity is too large.  Multiple dma_map_single
 > mappings are allowed to a given page as long as they don't collide on
 > the same cache line.
 > 
 > 
 > Please try the attached patch to see if it fixes this issue.  Works ok for me.

FWIW, since applying this, I haven't seen the 8169 warnings.

thanks,

	Dave
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