linux-kernel - Re: [PATCH] drm/panthor: Fix NULL vs IS_ERR() bug in panthor

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Message-ID: <20240402160327.60fb37e8@collabora.com>
Date: Tue, 2 Apr 2024 16:03:27 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Cc: Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
 <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Grant Likely
 <grant.likely@...aro.org>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, dan.carpenter@...aro.org,
 kernel-janitors@...r.kernel.org, error27@...il.com
Subject: Re: [PATCH] drm/panthor: Fix NULL vs IS_ERR() bug in
 panthor_probe()

On Tue,  2 Apr 2024 03:40:40 -0700
Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com> wrote:

> The devm_drm_dev_alloc() function returns error pointers.
> Update the error handling to check for error pointers instead of NULL.
> 
> Fixes: 4bdca1150792 ("drm/panthor: Add the driver frontend block")
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
> This is spotted by smatch and the patch is only compile tested
> ---
>  drivers/gpu/drm/panthor/panthor_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> index 11b3ccd58f85..1b588b37db98 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -1385,7 +1385,7 @@ static int panthor_probe(struct platform_device *pdev)
>  
>  	ptdev = devm_drm_dev_alloc(&pdev->dev, &panthor_drm_driver,
>  				   struct panthor_device, base);
> -	if (!ptdev)
> +	if (IS_ERR(ptdev))
>  		return -ENOMEM;
>  
>  	platform_set_drvdata(pdev, ptdev);