linux-kernel - Re: [PATCH 3/6] hwmon: (dell-smm) Disallow fan

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Message-Id: <201606190046.57390@pali>
Date:	Sun, 19 Jun 2016 00:46:57 +0200
From:	Pali Rohár <pali.rohar@...il.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean Delvare <jdelvare@...e.com>,
	Jan C Peters <jcpeters89@...il.com>,
	Thorsten Leemhuis <fedora@...mhuis.info>,
	David Santamaría Rogado <howl.nsp@...il.com>,
	Peter Saunderson <peteasa@...il.com>,
	Tolga Cakir <cevelnet@...il.com>,
	"Austin S. Hemmelgarn" <ahferroin7@...il.com>,
	Mario_Limonciello@...l.com,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Michał Kępień <kernel@...pniu.pl>,
	Dakota Whipple <dakotajaywhipple@...il.com>,
	Leon Yu <leon@...nyu.net>, linux-hwmon@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] hwmon: (dell-smm) Disallow fan_type() calls on broken machines

On Saturday 18 June 2016 22:08:17 Guenter Roeck wrote:
> On 06/17/2016 03:54 PM, Pali Rohár wrote:
> > Some Dell machines have especially broken SMM or BIOS which cause
> > that once fan_type() is called then CPU fan speed going randomly
> > up and down. And for fixing this behaviour reboot is required.
> > 
> > So this patch creates fan_type blacklist of affected Dell machines
> > and disallow fan_type() call on them to prevent that erratic
> > behaviour.
> > 
> > Old blacklist which disabled loading driver on some machines added
> > in commits a4b45b25f18d ("hwmon: (dell-smm) Blacklist Dell Studio
> > XPS 8100") and 6220f4ebd7b4 ("hwmon: (dell-smm) Blacklist Dell
> > Studio XPS 8000") were moved to FAN_TYPE blacklist.
> > 
> > Reported-by: Jan C Peters <jcpeters89@...il.com>
> > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > Link: https://bugzilla.kernel.org/show_bug.cgi?id=100121
> > Cc: stable@...r.kernel.org # v4.0+, will need backport
> 
> Applied.
> 
> It seemed worthwhile to apply this patch now, without waiting for
> further test feedback, since it at least reduces the impact of the
> observed problems. If follow-up changes are necessary, those will
> have to be applied in separate patches.
> 
> Guenter

Ok. Meanwhile patch was tested on Inspiron 580, so maybe it could be 
appended into commit message.

-- 
Pali Rohár
pali.rohar@...il.com

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