linux-kernel - Re: [PATCH] e100_shutdown: netif_poll

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Date:	Sat, 21 Oct 2006 10:54:02 -0700
From:	Auke Kok <auke-jan.h.kok@...el.com>
To:	Damien Wyart <damien.wyart@...e.fr>
CC:	Daniel Walker <dwalker@...sta.com>, Andrew Morton <akpm@...l.org>,
	Jeff Garzik <jgarzik@...ox.com>, linux-kernel@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	NetDev <netdev@...r.kernel.org>
Subject: Re: [PATCH] e100_shutdown: netif_poll_disable hang

Damien Wyart wrote:
>>>> My machine annoyingly hangs while rebooting. I tracked it down to
>>>> e100-fix-reboot-f-with-netconsole-enabled.patch in 2.6.18-rc2-mm2
>>>> I review the changes and it seemed to be calling
>>>> netif_poll_disable one too many time. Once in e100_down(), and
>>>> again in e100_shutdown().
>>>> The second one in e100_shutdown() caused the hang. So this patch
>>>> removes it.
> 
> * Auke Kok <auke-jan.h.kok@...el.com> [061020 23:09]:
>> it doesn't even do harm to netif_poll_disable() twice as far as I can
>> see, as it merely calls test_and_set_bit(), which will instantly
>> succeed on the first attempt if the bit was already set.
> 
>> did this change actually fix it for you? I'm wondering if the
>> netif_carrier_off might not be the culprit here...
> 
> I can confirm the proposed original change of D. Walker fixed the
> problem for me. I did not test the change you proposed as a followup.

his change breaks something else (a reboot with netconsole, possibly suspend). Please 
give the latest version I sent a try. Daniel confirmed me that it works, but it's always 
nice to hear it from more people.

Thanks

Auke
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