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

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Date:   Thu, 16 Nov 2017 18:00:23 -0800
From:   Darren Hart <dvhart@...radead.org>
To:     Mario Limonciello <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] platform/x86: dell-smbios-wmi: Disable userspace
 interface if missing hotfix

On Thu, Nov 16, 2017 at 02:48:30PM -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.

Is this "hotfix" the same thing as "having the latest firmware
installed" ?

If so, making that clear in the dev_warn messages would be more useful
to the person reading the log.

> 
> "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>
> ---
>  drivers/platform/x86/dell-smbios-wmi.c     | 14 ++++++++++++++
>  drivers/platform/x86/dell-wmi-descriptor.c | 26 ++++++++++++++++++++++++--
>  drivers/platform/x86/dell-wmi-descriptor.h |  1 +
>  3 files changed, 39 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/dell-smbios-wmi.c b/drivers/platform/x86/dell-smbios-wmi.c
> index 8ad11ef..a296551 100644
> --- a/drivers/platform/x86/dell-smbios-wmi.c
> +++ b/drivers/platform/x86/dell-smbios-wmi.c
> @@ -147,9 +147,12 @@ static long dell_smbios_wmi_filter(struct wmi_device *wdev, unsigned int cmd,
>  
>  static int dell_smbios_wmi_probe(struct wmi_device *wdev)
>  {
> +	struct wmi_driver *wdriver =
> +		container_of(wdev->dev.driver, struct wmi_driver, driver);
>  	struct wmi_smbios_priv *priv;
>  	int count;
>  	int ret;
> +	u32 hotfix;

Nit. Please keep local variables in descending order by length.
-- 
Darren Hart
VMware Open Source Technology Center