[PATCH v13 04/18] drm: exynos: dsi: Switch to DSI panel or bridge find helper

[Maxime Ripard]

On Mon, Feb 27, 2023 at 08:41:22PM +0100, Marek Vasut wrote:
> > If we go ahead with no need for DRM-managed helper at the moment, then
> > find the panel hook in host.attach and then drop 2/18.
> 
> The panel lookup must happen in .bind/.probe for exynos/imx respectively ,
> that's really all that is required here. Then you can drop 1,2,3/18 and get
> this series applied (I hope) .
> 
> Can you implement just this one change ?
> 
> There is no need to use drmm_* helper for now, that can be improved later if
> possible.

Yeah... The drmm helper isn't needed per se, but not using it will
create a use-after-free pattern that is very easy to miss.

I'd really prefer not to add a new helper that favors an unsafe pattern,
but the driver seems to have a whole bunch of them anyway so it's not
really a big deal.

Which also raises another question: if it's code that is only really
relevant in the context of that driver, why are you creating a helper
for it in the first place?

It would be much easier to just have that code in your driver: there's
no need to consider all cases, document it properly, you can have as
many workarounds as possible, etc.

Maxime
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