linux-kernel - Re: [PATCH v2] platform/x86: dell-smbios-wmi: Disable userspace interface if missing hotfix

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Date:   Mon, 20 Nov 2017 12:37:49 -0800
From:   Darren Hart <dvhart@...radead.org>
To:     Mario.Limonciello@...l.com
Cc:     andy.shevchenko@...il.com, linux-kernel@...r.kernel.org,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v2] platform/x86: dell-smbios-wmi: Disable userspace
 interface if missing hotfix

On Mon, Nov 20, 2017 at 04:03:53PM +0000, Mario.Limonciello@...l.com wrote:
> > -----Original Message-----
> > From: Darren Hart [mailto:dvhart@...radead.org]
> > Sent: Friday, November 17, 2017 2:39 PM
> > To: Limonciello, Mario <Mario_Limonciello@...l.com>
> > Cc: Andy Shevchenko <andy.shevchenko@...il.com>; LKML <linux-
> > kernel@...r.kernel.org>; platform-driver-x86@...r.kernel.org
> > Subject: Re: [PATCH v2] platform/x86: dell-smbios-wmi: Disable userspace
> > interface if missing hotfix
> > 
> > On Thu, Nov 16, 2017 at 10:13:12PM -0600, Mario Limonciello wrote:
> > > The Dell SMBIOS WMI interface will fail for some more complex calls unless
> > > a WMI hotfix has been included.  Most platforms have this fix available in
> > > a maintenance BIOS release.  In the case the driver is loaded on a
> > > platform without this fix, disable the userspace interface.
> > >
> > > A hotfix indicator is present in the dell-wmi-descriptor that represents
> > > whether or not more complex calls will work properly.
> > >
> > > "Simple" calls such as those used by dell-laptop and dell-wmi will continue
> > > to work properly so dell-smbios-wmi should not be blocked from binding and
> > > being used as the dell-smbios dispatcher.
> > >
> > > Suggested-by: Girish Prakash <girish.prakash@...l.com>
> > > Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
> > 
> > Queued up, thanks Mario.
> 
> Darren, even though this came after the merge windows opened considering this 
> restricts the SMBIOS interface from some platform/firmware combinations it 
> shouldn't be offered, do you think this can be included with a future 4.15 
> RCx PR so it can land with the rest of the series rather than targeted for 4.16?

This will make 4.15.

> 
> I'd hate to get stuck in a situation that an interface deemed "broken" gets offered
> to people it shouldn't.
> 

Agreed.

-- 
Darren Hart
VMware Open Source Technology Center