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Date:   Sun, 12 Apr 2020 16:18:42 +0200
From:   Sam Ravnborg <sam@ravnborg.org>
To:     Tian Tao <tiantao6@hisilicon.com>
Cc:     puck.chen@hisilicon.com, airlied@linux.ie, daniel@ffwll.ch,
        tzimmermann@suse.de, kraxel@redhat.com, alexander.deucher@amd.com,
        tglx@linutronix.de, dri-devel@lists.freedesktop.org,
        xinliang.liu@linaro.org, linux-kernel@vger.kernel.org,
        linuxarm@huawei.com
Subject: Re: [PATCH] drm/hisilicon: Add the shutdown for hibmc_pci_driver
Message-ID: <20200412141842.GA12313@ravnborg.org>
References: <1586573370-41945-1-git-send-email-tiantao6@hisilicon.com>
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In-Reply-To: <1586573370-41945-1-git-send-email-tiantao6@hisilicon.com>
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Hi Tian.

On Sat, Apr 11, 2020 at 10:49:30AM +0800, Tian Tao wrote:
> add the shutdown function to release the resource.
> 

Why it the release of the memory required in the shutdown method?
The memory is allocated using devm_ioremap() which
will let device management handle the release of the resources when
he driver is released.

The patch also introduces a pci_disable_device()
The better approch would be to use pcim_enable_device()
so you let the device management about releasing the
resources.

	Sam

> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index a6fd0c2..126d4f4 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -232,6 +232,21 @@ static int hibmc_hw_map(struct hibmc_drm_private *priv)
>  	return 0;
>  }
>  
> +static void hibmc_hw_unmap(struct hibmc_drm_private *priv)
> +{
> +	struct drm_device *dev = priv->dev;
> +
> +	if (priv->mmio)	{
> +		devm_iounmap(dev->dev, priv->mmio);
> +		priv->mmio = NULL;
> +	}
> +
> +	if (priv->fb_map) {
> +		devm_iounmap(dev->dev, priv->fb_map);
> +		priv->fb_map = NULL;
> +	}
> +}
> +
>  static int hibmc_hw_init(struct hibmc_drm_private *priv)
>  {
>  	int ret;
> @@ -258,6 +273,7 @@ static int hibmc_unload(struct drm_device *dev)
>  
>  	hibmc_kms_fini(priv);
>  	hibmc_mm_fini(priv);
> +	hibmc_hw_unmap(priv);
>  	dev->dev_private = NULL;
>  	return 0;
>  }
> @@ -374,6 +390,12 @@ static void hibmc_pci_remove(struct pci_dev *pdev)
>  	drm_dev_unregister(dev);
>  	hibmc_unload(dev);
>  	drm_dev_put(dev);
> +	pci_disable_device(pdev);
> +}
> +
> +static void hibmc_pci_shutdown(struct pci_dev *pdev)
> +{
> +	hibmc_pci_remove(pdev);
>  }
>  
>  static struct pci_device_id hibmc_pci_table[] = {
> @@ -386,6 +408,7 @@ static struct pci_driver hibmc_pci_driver = {
>  	.id_table =	hibmc_pci_table,
>  	.probe =	hibmc_pci_probe,
>  	.remove =	hibmc_pci_remove,
> +	.shutdown = hibmc_pci_shutdown,
>  	.driver.pm =    &hibmc_pm_ops,
>  };
>  
> -- 
> 2.7.4
> 
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