[RESEND PATCH v11 02/18] drm: bridge: panel: Add devm_drm_of_dsi_get_bridge helper

[Jagan Teki]

On Thu, Jan 26, 2023 at 5:42 PM Maxime Ripard <maxime at cerno.tech> wrote:
>
> Hi,
>
> On Mon, Jan 23, 2023 at 08:41:56PM +0530, Jagan Teki wrote:
> > Add devm OF helper to return the next DSI bridge in the chain.
> >
> > Unlike general bridge return helper devm_drm_of_get_bridge, this
> > helper uses the dsi specific panel_or_bridge helper to find the
> > next DSI device in the pipeline.
> >
> > Helper lookup a given child DSI node or a DT node's port and
> > endpoint number, find the connected node and return either
> > the associated struct drm_panel or drm_bridge device.
>
> I'm not sure that using a device managed helper is the right choice
> here. The bridge will stay longer than the backing device so it will
> create a use-after-free. You should probably use a DRM-managed action
> here instead.

Thanks for the comments. If I understand correctly we can use
drmm_panel_bridge_add instead devm_drm_panel_bridge_add once we found
the panel or bridge - am I correct?

Jagan.