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

[Hans de Goede]

Hi,

On 16-12-2019 11:26, Linus Walleij wrote:
> On Sun, Dec 15, 2019 at 5:38 PM Hans de Goede <hdegoede@xxxxxxxxxx> 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