Re: [PATCH 2/2] hp-wmi: remove GPS rfkill support via pre-2009 interface

From: Darren Hart
Date: Tue Mar 08 2016 - 08:11:51 EST

On Sun, Mar 06, 2016 at 11:40:19PM +0100, Maciej S. Szmigiero wrote:
> GPS rfkill support via pre-2009 WMI interface uses
> hp_wmi_get_sw_state() and hp_wmi_get_hw_state()
> to query its current hard and soft block state,
> respectively.
> In hp_wmi_get_sw_state() a mask is calculated which
> bit should be checked in an int value returned by
> firmware to get current block state:
> 0x200 << (r * 8) which with r being 3 for GPS
> results in overflow and mask of zero.
> The same goes for hp_wmi_get_hw_state().
> This effectively means that GPS rfkill on this
> WMI interface is considered always both hard and
> soft blocked.
> Unfortunately, later when rfkill subsystem calls
> hp_wmi_set_block() to sync this block to hardware
> firmware at least on my old nc6400 gets confused
> and sets both hard and soft blocks on WiFi and BT.
> This happens for example on hp-wmi module load.
> Since due to overflow described above it is dubious that
> this ever worked correctly and HP laptops with modems
> having GPS support seem to all have been released well past
> year 2009 let's just remove GPS rfkill support via
> pre-2009 WMI interface.

This looks reasonable. As it fails to apply without patch 1/2, please resubmit
along with my feedback for 1/2.

Also, please update your line wrap to 75 characters for commit messages.
(see Documentation/SubmittingPatches "14) The canonical patch format").

Darren Hart
Intel Open Source Technology Center