linux-kernel - Re: [PATCH v7 06/11] drm/bridge: get the bridge returned by drm_bridge_chain_get_first

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Message-ID: <20250317155730.4a328641@booty>
Date: Mon, 17 Mar 2025 15:57:30 +0100
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>, Neil Armstrong
 <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, Laurent
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 linux-kernel@...r.kernel.org, imx@...ts.linux.dev,
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Subject: Re: [PATCH v7 06/11] drm/bridge: get the bridge returned by
 drm_bridge_chain_get_first_bridge()

On Fri, 14 Mar 2025 19:10:41 +0100
Maxime Ripard <mripard@...nel.org> wrote:

> On Fri, Mar 14, 2025 at 11:31:19AM +0100, Luca Ceresoli wrote:
> > drm_bridge_chain_get_first_bridge() returns a bridge pointer that the
> > caller could hold for a long time. Increment the refcount of the returned
> > bridge and document it must be put by the caller.
> > 
> > Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>

...

> > @@ -1112,8 +1115,8 @@ drm_bridge_get_prev_bridge(struct drm_bridge *bridge)
> >  static inline struct drm_bridge *
> >  drm_bridge_chain_get_first_bridge(struct drm_encoder *encoder)
> >  {
> > -	return list_first_entry_or_null(&encoder->bridge_chain,
> > -					struct drm_bridge, chain_node);
> > +	return drm_bridge_get(list_first_entry_or_null(&encoder->bridge_chain,
> > +						       struct drm_bridge, chain_node));
> >  }  
> 
> We'll need to modify drm_bridge_get_next_bridge, drm_bridge_get_prev_bridge, and
> drm_for_each_bridge_in_chain in a similar manner, but for this one

Sure. I'm discussing this in the cover letter.

Luca

-- 
Luca Ceresoli, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com