linux-kernel - Re: [PATCH] drm/bridge: analogix_dp: Fix bailout for devm_drm_bridge

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Message-ID: <20250806112641.7af982e3@booty>
Date: Wed, 6 Aug 2025 11:26:41 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Liu Ying <victor.liu@....com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org,
 Laurent.pinchart@...asonboard.com, jonas@...boo.se,
 jernej.skrabec@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
 simona@...ll.ch, dmitry.baryshkov@....qualcomm.com, dianders@...omium.org,
 damon.ding@...k-chips.com, m.szyprowski@...sung.com
Subject: Re: [PATCH] drm/bridge: analogix_dp: Fix bailout for
 devm_drm_bridge_alloc()

Hello Liu,

On Wed,  6 Aug 2025 16:54:24 +0800
Liu Ying <victor.liu@....com> wrote:

> devm_drm_bridge_alloc() returns ERR_PTR on failure instead of a
> NULL pointer, so use IS_ERR() to check the returned pointer.
> 
> Fixes: 48f05c3b4b70 ("drm/bridge: analogix_dp: Use devm_drm_bridge_alloc() API")
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
>  drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index ed35e567d117..86cf898a09bb 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -1474,7 +1474,7 @@ analogix_dp_probe(struct device *dev, struct analogix_dp_plat_data *plat_data)
>  
>  	dp = devm_drm_bridge_alloc(dev, struct analogix_dp_device, bridge,
>  				   &analogix_dp_bridge_funcs);
> -	if (!dp)
> +	if (IS_ERR(dp))
>  		return ERR_PTR(-ENOMEM);

Good catch, thanks!

You fix is correct but now I realized one additional fix is needed in
the following line:

-		return ERR_PTR(-ENOMEM);
+		return ERR_PTR(dp);

Can you send a v2 with that fixed?

Luca

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