linux-kernel - Re: [PATCH RFC 2/2] drm/panel/panel-simple: Use the new allocation in place of devm

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Message-ID: <3c688493-02db-461d-b07c-34f2f4477f01@linaro.org>
Date: Mon, 17 Mar 2025 11:12:03 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Anusha Srivatsa <asrivats@...hat.com>,
 Jessica Zhang <quic_jesszhan@...cinc.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: Luca Ceresoli <luca.ceresoli@...tlin.com>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] drm/panel/panel-simple: Use the new allocation in
 place of devm_kzalloc()

On 13/03/2025 01:54, Anusha Srivatsa wrote:
> Start using the new helper that does the refcounted
> allocations.
> 
> Signed-off-by: Anusha Srivatsa <asrivats@...hat.com>
> ---
>   drivers/gpu/drm/panel/panel-simple.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 232b03c1a259eb15e423b9d452d28e2ff95c70f8..d7530c3533af34f83ce8c6d6067e7f293f2d4bf1 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -579,7 +579,7 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
>   	u32 bus_flags;
>   	int err;
>   
> -	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
> +	panel = devm_drm_panel_alloc(dev, struct panel_simple, base, &panel_simple_funcs);
>   	if (!panel)
>   		return -ENOMEM;
>   
> @@ -694,8 +694,6 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc)
>   	pm_runtime_set_autosuspend_delay(dev, 1000);
>   	pm_runtime_use_autosuspend(dev);
>   
> -	drm_panel_init(&panel->base, dev, &panel_simple_funcs, connector_type);

As pointed by the helpers review, you're loosing the connector_type info here.

> -
>   	err = drm_panel_of_backlight(&panel->base);
>   	if (err) {
>   		dev_err_probe(dev, err, "Could not find backlight\n");
> 

Thanks !
Neil