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

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Message-ID: <20151021084844.GA42240@vmdeb7>
Date:	Wed, 21 Oct 2015 10:48:44 +0200
From:	Darren Hart <dvhart@...radead.org>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Azael Avalos <coproscefalo@...il.com>,
	Darren Hart <dvhart@...ux.intel.com>
Subject: Re: [PATCH 4.2 022/258] toshiba_acpi: Fix hotkeys registration on
 some toshiba models

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.

-- 
Darren Hart
Intel Open Source Technology Center
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