netdev - Re: 2.6.23-rc4-mm1: e1000e napi lockup

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Message-Id: <20070907.010338.41638771.davem@davemloft.net>
Date:	Fri, 07 Sep 2007 01:03:38 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jirislaby@...il.com
Cc:	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net, auke-jan.h.kok@...el.com
Subject: Re: 2.6.23-rc4-mm1: e1000e napi lockup

From: Jiri Slaby <jirislaby@...il.com>
Date: Fri, 07 Sep 2007 09:19:30 +0200

> I found a regression in 2.6.23-rc4-mm1 (since -rc3-mm1) in e1000e driver.
> napi_disable(&adapter->napi) in e1000_probe freezes the kernel on boot.

Yes, the semantics changed slightly in the net-2.6.24 tree the
other week and someone needs to fix it up.

The netif_napi_add() implicitly does a napi_disable() call.  Device
open must explicitly napi_enable() and device close must explicitly
napi_disable(), and if done elsewhere these calls must be strictly
balanced.
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