linux-kernel - Re: NULL pointer dereference in i2c-hid

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Message-ID: <20141211085801.GR1300@lahna.fi.intel.com>
Date:	Thu, 11 Dec 2014 10:58:01 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Gabriele Mazzotta <gabriele.mzt@...il.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	benjamin.tissoires@...hat.com, aduggan@...aptics.com,
	jkosina@...e.cz
Subject: Re: NULL pointer dereference in i2c-hid

On Wed, Dec 10, 2014 at 06:04:51PM +0100, Gabriele Mazzotta wrote:
> my laptop uses a touchpad that needs hid-rmi along with i2c-hid to work.
> i2c-hid and hid-rmi can be loaded and unloaded independelty from each
> other, however since 34f439e4afcd ("HID: i2c-hid: add runtime PM support")
> if I unload hid-rmi and after it I also unload i2c-hid, I get a NULL
> pointer dereference.

I'll look into this.

I can reproduce this easily with i2c-hid + hid-multitouch following your
directions.
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