linux-kernel - Re: [Openipmi-developer] modprobe ipmi

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Date:	Wed, 20 May 2009 18:15:43 +0200
From:	Ferenc Wagner <wferi@...f.hu>
To:	Corey Minyard <minyard@....org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	openipmi-developer@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, dann frazier <dannf@...com>
Subject: Re: [Openipmi-developer] modprobe ipmi_si hangs under 2.6.30-rc5

Corey Minyard <minyard@....org> writes:

> I know what is happening now.  Can you try the attached patch?  I'm
> disabling the requeue and discarding the message when an IPMB message
> is received before everything is initialized.  If you don't, the code
> will not deliver any messages because something is already in the
> queue.

Yep, that fixed it, modprobe runs through now!

> Ferenc Wagner wrote:
>
>> My concern is that it does something too often, not letting the CPU
>> enter deep sleep states, perhaps.  Or is that also an artifact of
>> debugging?
>
> No, it's an artifact of a lousy hardware interface.  Very few IPMI
> interfaces support interrupts, so they have to be polled :(.

I'd say this isn't an artifact but the sad truth itself.  Just out of
interest, how often does the driver wake up to check the inteface?
-- 
Thanks,
Feri.
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