netdev - Re: [PATCH net-next] be2net: fix a possible events

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Date:	Fri, 23 Nov 2012 14:26:21 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	sathya.perla@...lex.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] be2net: fix a possible events_get() race on
 BE2

From: Sathya Perla <sathya.perla@...lex.com>
Date: Fri, 23 Nov 2012 15:57:18 +0530

> On BE2 chip, an interrupt being raised even when EQ is in un-armed state has
> been observed a few times.  This is not expected and has never been
> observed on BE3/Lancer chips.
> 
> As a consequence, be_msix()::events_get() and be_poll()::events_get()
> can race and notify an EQ wrongly causing a CEV UE. The other possible
> side-effect would be traffic stalling because after notifying EQ,
> napi_schedule() is ignored as NAPI is already running.
> 
> This patch fixes this issue by counting events only in be_poll().
> 
> Signed-off-by: Sathya Perla <sathya.perla@...lex.com>

Applied, thanks.
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