linux-kernel - Re: [appleir] BUG: unable to handle kernel NULL pointer dereference

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Message-ID: <alpine.LRH.2.00.1311160121310.24147@twin.jikos.cz>
Date:	Sat, 16 Nov 2013 01:21:56 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:	James Henstridge <james.henstridge@...onical.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Luis Henriques <luis.henriques@...onical.com>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	Fabien André <fabien.andre@...il.com>,
	Bastien Nocera <hadess@...ess.net>
Subject: Re: [appleir] BUG: unable to handle kernel NULL pointer
 dereference

On Thu, 7 Nov 2013, Benjamin Tissoires wrote:

> Ok, thanks for the report. Could you please test the following patch
> which should solve your problem (hopefully)?

James, do you happen to have testing results please?

> 
> Cheers,
> Benjamin
> 
> --
> 
> >From 54b332b992da1666abe7180b6cecd313c864e0b7 Mon Sep 17 00:00:00 2001
> From: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> Date: Thu, 7 Nov 2013 10:46:48 -0500
> Subject: [PATCH] HID: appleir: force input to be set
> 
> Some weird remotes are not correctly creating the input device. Their
> report descriptor starts with:
> 0x06, 0x00, 0xff,              // Usage Page (Vendor Defined Page 1)  0
> 0xa1, 0x01,                    // Collection (Application)            3
> 
> whereas others (which are correctly handled) start with:
> 0x05, 0x0c,                    // Usage Page (Consumer Devices)       0
> 0x09, 0x01,                    // Usage (Consumer Control)            2
> 0xa1, 0x01,                    // Collection (Application)            4
> 
> The rest of the report descriptor is the same.
> 
> Adding the quirk HID_QUIRK_HIDINPUT_FORCE forces hid-input to allocate
> the inputs, and everything should be ok.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> ---
>  drivers/hid/hid-appleir.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/hid/hid-appleir.c b/drivers/hid/hid-appleir.c
> index a42e6a3..0e6a42d 100644
> --- a/drivers/hid/hid-appleir.c
> +++ b/drivers/hid/hid-appleir.c
> @@ -297,6 +297,9 @@ static int appleir_probe(struct hid_device *hid, const struct hid_device_id *id)
>  
>  	appleir->hid = hid;
>  
> +	/* force input as some remotes bypass the input registration */
> +	hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;
> +
>  	spin_lock_init(&appleir->lock);
>  	setup_timer(&appleir->key_up_timer,
>  		    key_up_tick, (unsigned long) appleir);
> 

-- 
Jiri Kosina
SUSE Labs

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