Message-ID: <3FAF82D2.2050004@pacbell.net>
Date: Mon, 10 Nov 2003 04:21:38 -0800
From: David Brownell <david-b@pacbell.net>
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To: Greg KH <greg@kroah.com>, colin@colino.net
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: kernel 2.6 : cdc_acm problem
References: <3FAE77B7.8040901@pacbell.net> <20031109225027.GA2425@kroah.com>
In-Reply-To: <20031109225027.GA2425@kroah.com>
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>>The problem is that cdc_acm calls a "softirq-only" routine
>>in a hardirq context.  See this patch:
>>
>>http://marc.theaimsgroup.com/?l=linux-usb-devel&m=106764585001038&w=2
>>
>>It's not clear that'll make it into 2.6.0-final.
> 
> 
> I've not planned to submit it for 2.6.0 as it's a relativly big change,
> and I don't have the hardware to test it out.  Anyone have any other
> thoughts about this?

Doesn't seem big to me.  It could be shrunk a smidgeon, but
that's the version that's gotten the positive test results.

The folk who have this kind of hardware have reported this
happening for quite a few months now, and it does seem to
fill up log buffers with catastrophic-seeming stack traces.

Colin, does it fix your problem?  Can you eke more than
twenty minutes from your laptop battery now?  :)

- Dave

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