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

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Message-ID: <1309891516.2545.23.camel@edumazet-laptop>
Date:	Tue, 05 Jul 2011 20:45:16 +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 20:32 +0200, Eric Dumazet a écrit :

> Then, maybe the driver model is completely wrong, and should really
> setup 512 buffers, or use less descs but set EOT on last one.
> 
> Currently it uses a 200 sliding window out of the 512 descs.
> 
> 

One thing we could do would be to allocate a special guard buffer and
set all 'out of window' descriptors to point to this guard buffer, and
periodically check if buffer is dirtied by the card.

(first word would be enough)

(instead of setting desc->addr to NULL, set to
dma_map_single(guard_buffer))



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