linux-kernel - Re: [PATCH] base/platform: Fix platform drivers with no probe callback (ex alarmtimer)

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Date:	Tue, 5 Jan 2016 14:02:21 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Tero Roponen <tero.roponen@...il.com>
Cc:	Martin Fuzzey <mfuzzey@...keon.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] base/platform: Fix platform drivers with no probe
 callback (ex alarmtimer)

On Tue, Jan 05, 2016 at 12:02:23PM +0200, Tero Roponen wrote:
> 
> On Tue, 5 Jan 2016, Uwe Kleine-König wrote:
> 
> > Hello,
> > 
> > I think this is the same problem that another Martin found and fixed in
> > 
> > http://mid.gmane.org/1449132704-9952-1-git-send-email-martin.wilck@ts.fujitsu.com
> > 
> > I didn't check, but thought Greg already picked that up?!
> 
> I can confirm that applying the patch in that link to 4.4-rc8 fixes the
> following problem I've seen since 4.4-rc5:
> 
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000e20
> IP: [<ffffffffa017835e>] asus_sysfs_is_visible+0xe/0x1d0 [asus_laptop]

This is a separate bug however that is worth fixing, too. I guess this
is similar to the tpm problem my broken patch made obvious.

Best regards
Uwe


-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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