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

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Message-ID: <46E1E391.7090907@garzik.org>
Date:	Fri, 07 Sep 2007 19:49:37 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
CC:	David Miller <davem@...emloft.net>, jirislaby@...il.com,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net
Subject: Re: 2.6.23-rc4-mm1: e1000e napi lockup

Kok, Auke wrote:
> Jeff Garzik wrote:
>> Kok, Auke wrote:
>>> David Miller wrote:
>>>> 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.
>>> I'll fix it... it's my patch that adds the new napi code to it and I 
>>> need to get it ready for the merge window anyway.
>>
>> well....  since its close to the merge window opening, we could see 
>> what happens if DaveM pulls branch 'upstream' of 
>> git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/netdev-2.6.git
>>
>> That should make this class of pre-merge-window annoyance go away.
> 
> If I do that now I get a big merge conflict:

oh you are _guaranteed_ conflicts.  most of that is NAPI-area code that 
got changed by both.


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