linux-kernel - Re: [PATCH 1/4] panthor: set owner field for driver fops

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Message-ID: <20250623081651.26fd2cd5@fedora>
Date: Mon, 23 Jun 2025 08:16:51 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Chia-I Wu <olvaffe@...il.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>, Simona Vetter <simona@...ll.ch>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] panthor: set owner field for driver fops

On Fri, 20 Jun 2025 16:50:50 -0700
Chia-I Wu <olvaffe@...il.com> wrote:

> It allows us to get rid of manual try_module_get / module_put.
> 
> Signed-off-by: Chia-I Wu <olvaffe@...il.com>

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

> ---
>  drivers/gpu/drm/panthor/panthor_drv.c | 14 +++-----------
>  1 file changed, 3 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> index 1116f2d2826ee..775a66c394544 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -1400,14 +1400,9 @@ panthor_open(struct drm_device *ddev, struct drm_file *file)
>  	struct panthor_file *pfile;
>  	int ret;
>  
> -	if (!try_module_get(THIS_MODULE))
> -		return -EINVAL;
> -
>  	pfile = kzalloc(sizeof(*pfile), GFP_KERNEL);
> -	if (!pfile) {
> -		ret = -ENOMEM;
> -		goto err_put_mod;
> -	}
> +	if (!pfile)
> +		return -ENOMEM;
>  
>  	pfile->ptdev = ptdev;
>  	pfile->user_mmio.offset = DRM_PANTHOR_USER_MMIO_OFFSET;
> @@ -1439,9 +1434,6 @@ panthor_open(struct drm_device *ddev, struct drm_file *file)
>  
>  err_free_file:
>  	kfree(pfile);
> -
> -err_put_mod:
> -	module_put(THIS_MODULE);
>  	return ret;
>  }
>  
> @@ -1454,7 +1446,6 @@ panthor_postclose(struct drm_device *ddev, struct drm_file *file)
>  	panthor_vm_pool_destroy(pfile);
>  
>  	kfree(pfile);
> -	module_put(THIS_MODULE);
>  }
>  
>  static const struct drm_ioctl_desc panthor_drm_driver_ioctls[] = {
> @@ -1555,6 +1546,7 @@ static void panthor_show_fdinfo(struct drm_printer *p, struct drm_file *file)
>  }
>  
>  static const struct file_operations panthor_drm_driver_fops = {
> +	.owner = THIS_MODULE,
>  	.open = drm_open,
>  	.release = drm_release,
>  	.unlocked_ioctl = drm_ioctl,