linux-kernel - Re: [PATCH 0/5] drm/i915/dsi: Control panel and backlight enable GPIOs from VBT

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Date:   Mon, 16 Dec 2019 12:11:31 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Lee Jones <lee.jones@...aro.org>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH 0/5] drm/i915/dsi: Control panel and backlight enable
 GPIOs from VBT

Hi,

On 16-12-2019 11:26, Linus Walleij wrote:
> On Sun, Dec 15, 2019 at 5:38 PM Hans de Goede <hdegoede@...hat.com> wrote:
> 
>> Linus, this series starts with the already discussed pinctrl change to
>> export the function to unregister a pinctrl-map. We can either merge this
>> through drm-intel, or you could pick it up and then provide an immutable
>> branch with it for merging into drm-intel-next. Which option do you prefer?
> 
> I have created an immutable branch with these changes and pulled it
> to my "devel" branch for v5.6:
> https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl.git/log/?h=ib-pinctrl-unreg-mappings

Ugh, taking one last look at the "pinctrl: Export pinctrl_unregister_mappings"
patch it is no good, sorry.

I just realized that if the mapping has been dupped, the if (maps_node->maps == map)
check will never be true, because maps_node->maps is the return value from kmemdup
and map is the map originally passed in while registering.

Linus, can you please drop this from your -next ?

So I see 2 options:
1) Add an orig_map member to maps_node and use that in the comparison,
this is IMHO somewhat ugly

2) Add a new pinctrl_register_mappings_no_dup helper and document in
pinctrl_unregister_mappings kdoc that it can only be used together
with the no_dup variant.

I believe that 2 is by far the best option. Linus do you agree or
do you have any other suggestions?

Regards,

Hans