linux-kernel - Re: [PATCH 4/5] vfio: platform: Convert to use devm

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Date:   Sun, 2 Apr 2017 16:45:28 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Leo Yan <leo.yan@...aro.org>, Russell King <linux@...linux.org.uk>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Baptiste Reynal <b.reynal@...tualopensystems.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 4/5] vfio: platform: Convert to use devm_*()

Hi Leo,

On 26/03/2017 16:41, Leo Yan wrote:
> Convert driver to use devm_*() APIs so rely on driver model core layer
> to manage resources. This eliminates error path boilerplate and makes
> code neat.
> 
> This patch also renames amba_id structure, the old code used some code
> which directly copied from other driver.
> 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
Looks good to me
Reviewed-by: Eric Auger <eric.auger@...hat.com>

May be interesting to go further converting as well the vfio-platform
driver but this can be done later on.

Thanks

Eric


> ---
>  drivers/vfio/platform/vfio_amba.c | 25 ++++++++-----------------
>  1 file changed, 8 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/vfio/platform/vfio_amba.c b/drivers/vfio/platform/vfio_amba.c
> index 31372fb..433db1f 100644
> --- a/drivers/vfio/platform/vfio_amba.c
> +++ b/drivers/vfio/platform/vfio_amba.c
> @@ -53,15 +53,14 @@ static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
>  	struct vfio_platform_device *vdev;
>  	int ret;
>  
> -	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
> +	vdev = devm_kzalloc(&adev->dev, sizeof(*vdev), GFP_KERNEL);
>  	if (!vdev)
>  		return -ENOMEM;
>  
> -	vdev->name = kasprintf(GFP_KERNEL, "vfio-amba-%08x", adev->periphid);
> -	if (!vdev->name) {
> -		kfree(vdev);
> +	vdev->name = devm_kasprintf(&adev->dev, GFP_KERNEL,
> +				    "vfio-amba-%08x", adev->periphid);
> +	if (!vdev->name)
>  		return -ENOMEM;
> -	}
>  
>  	vdev->opaque = (void *) adev;
>  	vdev->flags = VFIO_DEVICE_FLAGS_AMBA;
> @@ -71,11 +70,6 @@ static int vfio_amba_probe(struct amba_device *adev, const struct amba_id *id)
>  	vdev->reset_required = false;
>  
>  	ret = vfio_platform_probe_common(vdev, &adev->dev);
> -	if (ret) {
> -		kfree(vdev->name);
> -		kfree(vdev);
> -	}
> -
>  	return ret;
>  }
>  
> @@ -84,25 +78,22 @@ static int vfio_amba_remove(struct amba_device *adev)
>  	struct vfio_platform_device *vdev;
>  
>  	vdev = vfio_platform_remove_common(&adev->dev);
> -	if (vdev) {
> -		kfree(vdev->name);
> -		kfree(vdev);
> +	if (vdev)
>  		return 0;
> -	}
>  
>  	return -EINVAL;
>  }
>  
> -static struct amba_id pl330_ids[] = {
> +static struct amba_id vfio_ids[] = {
>  	{ 0, 0 },
>  };
>  
> -MODULE_DEVICE_TABLE(amba, pl330_ids);
> +MODULE_DEVICE_TABLE(amba, vfio_ids);
>  
>  static struct amba_driver vfio_amba_driver = {
>  	.probe = vfio_amba_probe,
>  	.remove = vfio_amba_remove,
> -	.id_table = pl330_ids,
> +	.id_table = vfio_ids,
>  	.drv = {
>  		.name = "vfio-amba",
>  		.owner = THIS_MODULE,
>