linux-kernel - Re: [PATCH 4.2 022/258] toshiba_acpi: Fix hotkeys registration on some toshiba models

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Date:	Mon, 26 Oct 2015 10:52:33 -0600
From:	Azael Avalos <coproscefalo@...il.com>
To:	Darren Hart <dvhart@...radead.org>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org, Darren Hart <dvhart@...ux.intel.com>
Subject: Re: [PATCH 4.2 022/258] toshiba_acpi: Fix hotkeys registration on
 some toshiba models

Hi there,

Sorry for the late reply :-(

2015-10-21 2:48 GMT-06:00 Darren Hart <dvhart@...radead.org>:
> On Tue, Oct 20, 2015 at 12:32:45AM +0100, Ben Hutchings wrote:
>> On Sat, 2015-10-17 at 18:55 -0700, Greg Kroah-Hartman wrote:
>> > 4.2-stable review patch.  If anyone has any objections, please let me know.
>> >
>> > ------------------
>> >
>> > From: Azael Avalos <coproscefalo@...il.com>
>> >
>> > commit 53147b6cabee5e8d1997b5682fcc0c3b72ddf9c2 upstream.
>> >
>> > Commit a2b3471b5b13 ("toshiba_acpi: Use the Hotkey Event Type function
>> > for keymap choosing") changed the *setup_keyboard function to query for
>> > the Hotkey Event Type to help choose the correct keymap, but turns out
>> > that here are certain Toshiba models out there not implementing this
>> > feature, and thus, failing to continue the input device registration and
>> > leaving such laptops without hotkey support.
>> >
>> > This patch changes such check, and instead of returning an error if
>> > the Hotkey Event Type is not present, we simply inform userspace about it,
>> > changing the message printed from err to notice, making the function
>> > responsible for registering the input device to continue.
>> [...]
>>
>> But then this function proceeds without events_type being initialised
>> at all, with unpredictable results.  This doesn't look like a proper
>>  fix.
>
> Azael, Ben has a point. Even after later patches, dev->hotkey_event_type doesn't
> have a default value, so the later check for HCI_SYSTEM_TYPE1 or
> HCI_SYSTEM_TYPE2 or failure is unpredictable.

Yes, I see the issue here.
Since the function was returning before the variable value didin't matter,
and when "fixing" the issue on the mentioned model I never took the
variable initialization into account.

I'll send a patch probably later today addressing this issue.

>
> --
> Darren Hart
> Intel Open Source Technology Center


Cheers
Azael


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