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Re: [PATCH 09/12] platform/x86: wmi: create character devices when requested by drivers

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On Thu, Sep 21, 2017 at 4:57 PM, Mario Limonciello
<mario.limonciello@dell.com> wrote:
> For WMI operations that are only Set or Query read or write sysfs
> attributes created by WMI vendor drivers make sense.
>
> For other WMI operations that are run on Method, there needs to be a
> way to guarantee to userspace that the results from the method call
> belong to the data request to the method call.  Sysfs attributes don't
> work well in this scenario because two userspace processes may be
> competing at reading/writing an attribute and step on each other's
> data.
>
> When a WMI vendor driver declares a set of functions in a
> file_operations object the WMI bus driver will create a character
> device that maps to those file operations.
>
> The WMI vendor drivers will be responsible for managing access to
> this character device and proper locking on it.
>
> When a WMI vendor driver is unloaded the WMI bus driver will clean
> up the character device.
>

> @@ -44,12 +44,17 @@
>  #include <linux/platform_device.h>
>  #include <linux/wmi.h>
>  #include <linux/uuid.h>
> +#include <linux/cdev.h>
> +#include <linux/idr.h>

Keep alphabetical ordering.


-- 
With Best Regards,
Andy Shevchenko

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[PATCH 00/12] Introduce support for Dell SMBIOS over WMI Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 08/12] platform/x86: wmi: Cleanup exit routine in reverse order of init Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 02/12] platform/x86: dell-wmi: Don't match on descriptor GUID modalias Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 02/12] platform/x86: dell-wmi: Don't match on descriptor  GUID modalias Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:10 +0200
  [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI interface Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI  interface Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:30 +0200
      RE: [PATCH 04/12] platform/x86: dell-smbios: Switch to a WMI-ACPI  interface <Mario.Limonciello@dell.com> - 2017-09-25 21:30 +0200
  [PATCH 12/12] platform/x86: Kconfig: Change the default settings for dell-wmi-smbios Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 01/12] platform/x86: dell-wmi: label driver as handling notifications Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 01/12] platform/x86: dell-wmi: label driver as handling  notifications Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:10 +0200
      RE: [PATCH 01/12] platform/x86: dell-wmi: label driver as handling  notifications <Mario.Limonciello@dell.com> - 2017-09-25 22:20 +0200
  [PATCH 10/12] platform/x86: wmi: destroy on cleanup rather than unregister Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
  [PATCH 07/12] platform/x86: dell-wmi-smbios: Use Dell WMI descriptor check Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 07/12] platform/x86: dell-wmi-smbios: Use Dell WMI  descriptor check Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-09-21 18:50 +0200
      RE: [PATCH 07/12] platform/x86: dell-wmi-smbios: Use Dell WMI  descriptor check <Mario.Limonciello@dell.com> - 2017-09-21 23:00 +0200
  [PATCH 09/12] platform/x86: wmi: create character devices when requested by drivers Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:00 +0200
    Re: [PATCH 09/12] platform/x86: wmi: create character devices when  requested by drivers Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-09-21 18:50 +0200
      RE: [PATCH 09/12] platform/x86: wmi: create character devices when  requested by drivers <Mario.Limonciello@dell.com> - 2017-09-21 21:30 +0200
  [PATCH 03/12] platform/x86: dell-smbios: Add pr_fmt definition to driver Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:10 +0200
    Re: [PATCH 03/12] platform/x86: dell-smbios: Add pr_fmt definition to driver Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-09-21 18:30 +0200
    Re: [PATCH 03/12] platform/x86: dell-smbios: Add pr_fmt definition  to driver Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:10 +0200
  [PATCH 05/12] platform/x86: dell-smbios: rename to dell-wmi-smbios Mario Limonciello <mario.limonciello@dell.com> - 2017-09-21 16:10 +0200
  Re: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:20 +0200
    RE: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI <Mario.Limonciello@dell.com> - 2017-09-25 18:40 +0200
      Re: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI Pali Rohár <pali.rohar@gmail.com> - 2017-09-25 18:50 +0200
        RE: [PATCH 00/12] Introduce support for Dell SMBIOS over WMI <Mario.Limonciello@dell.com> - 2017-09-25 21:30 +0200

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