netdev - Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison overwritten

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Message-ID: <1309884441.2271.34.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Tue, 05 Jul 2011 18:47:21 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Alexey Zaytsev <alexey.zaytsev@...il.com>,
	Michael Büsch <m@...s.ch>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev@...r.kernel.org, Gary Zambrano <zambrano@...adcom.com>,
	bugme-daemon@...zilla.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Pekka Pietikainen <pp@...oulu.fi>,
	Florian Schirmer <jolt@...box.org>,
	Felix Fietkau <nbd@...nwrt.org>, Michael Buesch <mb@...sch.de>
Subject: Re: [Bugme-new] [Bug 38102] New: BUG kmalloc-2048: Poison
 overwritten

Le mardi 05 juillet 2011 à 12:42 -0400, Neil Horman a écrit :
> On Tue, Jul 05, 2011 at 06:12:32PM +0200, Eric Dumazet wrote:

> > So all descriptors before prod are guaranteed to be ready for host
> > consume... Fact that a dma access is running on 'next descriptor' should
> > be irrelevant.
> > 
> But we handle more than one descriptor per b44_rx call - theres a while loop in
> there where we do advance to the next descriptor.

Yes, but we advance up to 'prod', which is the very last safe
descriptor.

If hardware advertises descriptor X being ready to be handled by host,
while DMA on this X descriptor is not yet finished, this would be a
really useless hardware ;)



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