netdev - Re: [PATCH] 8139too: harden against TX ring overflow

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Date:	Fri, 06 Apr 2007 11:48:32 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	sshtylyov@...mvista.com (Sergei Shtylyov)
Cc:	jgarzik@...ox.com, netdev@...r.kernel.org, mhuth@...sta.com,
	kgdb-bugreport@...ts.sourceforge.net
Subject: Re: [PATCH] 8139too: harden against TX ring overflow

Sergei Shtylyov <sshtylyov@...mvista.com> wrote:
> This driver's 4-packet deep TX queue is too sensible to the "careless" callers
> ignoring its state (like netpoll in trapped mode), so add "queue full" check at
> the start of the hard_start_xmit() method (only under #ifndef RTL8139_NDEBUG,
> otherwise the queue will get stuck once dirty pointer gets out of sync); switch
> to using appropriate mnemonics for the return values while at it.

Could you please describe this netpoll scenario in more detail?
More importantly, why wouldn't we fix netpoll instead?

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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