linux-kernel - Re: applesmc oops in 3.10/3.11

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Message-Id: <6918F624-B267-4DB5-95A2-7E09448CA3E4@colorremedies.com>
Date:	Mon, 7 Oct 2013 17:46:55 -0600
From:	Chris Murphy <bugzilla@...orremedies.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Henrik Rydberg <rydberg@...omail.se>,
	Josh Boyer <jwboyer@...oraproject.org>, khali@...ux-fr.org,
	lm-sensors@...sensors.org,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: applesmc oops in 3.10/3.11


On Oct 7, 2013, at 5:42 PM, Guenter Roeck <linux@...ck-us.net> wrote:

> On 10/02/2013 10:24 AM, Henrik Rydberg wrote:
> 
>>> From 4451da32414080bd0563ee9e061f19bf90463cc5 Mon Sep 17 00:00:00 2001
>> From: Henrik Rydberg <rydberg@...omail.se>
>> Date: Wed, 2 Oct 2013 19:15:03 +0200
>> Subject: [PATCH] applesmc remedy take 2
>> 
>> Conjectured problem: there are remnant bytes ready on the data line
>> which corrupts the read after a failure.
>> 
>> Remedy: assuming bit0 is the read valid line, try to flush it before
>> starting a new command.
>> 
>> Tests by Chris suggests reading the status is enough for the problem
>> to go away, which is consistent with a change in the SMC interface,
>> where the number of bytes to read is no longer specified, but found
>> out by reading until end of data.
>> 
>> Tested on a MacBookAir3,1, but the original problem has not been
>> reproduced.
> 
> So, what should we do with this patch ? Apply it ?

So far I'm getting nothing on the original machine. As of today it's applied as the last patch on 3.12.0-0.rc4.git0.1.fc20.x86_64. Unfortunately at the moment I'm a bit too dense to figure out how to get a new kernel applied to an existing live package so I can try this on a USB stick. While maybe unrelated, the oops was occurring at least 4x as often booted from USB stick media than HDD.

Chris--
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