linux-kernel - Re: [PATCH] drm/komeda: Use devm_platform_ioremap_resource() in komeda_dev

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Date:   Mon, 23 Sep 2019 06:54:18 +0000
From:   "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To:     Markus Elfring <Markus.Elfring@....de>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Brian Starkey <Brian.Starkey@....com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Liviu Dudau <Liviu.Dudau@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [PATCH] drm/komeda: Use devm_platform_ioremap_resource() in
 komeda_dev_create()

On Sat, Sep 21, 2019 at 07:50:46PM +0200, Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 21 Sep 2019 19:43:51 +0200
> 
> Simplify this function implementation by using a known wrapper function.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> index ca64a129c594..a387d923962e 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c
> @@ -172,19 +172,12 @@ struct komeda_dev *komeda_dev_create(struct device *dev)
>  	struct platform_device *pdev = to_platform_device(dev);
>  	const struct komeda_product_data *product;
>  	struct komeda_dev *mdev;
> -	struct resource *io_res;
>  	int err = 0;
> 
>  	product = of_device_get_match_data(dev);
>  	if (!product)
>  		return ERR_PTR(-ENODEV);
> 
> -	io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (!io_res) {
> -		DRM_ERROR("No registers defined.\n");
> -		return ERR_PTR(-ENODEV);
> -	}
> -
>  	mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
>  	if (!mdev)
>  		return ERR_PTR(-ENOMEM);
> @@ -192,7 +185,7 @@ struct komeda_dev *komeda_dev_create(struct device *dev)
>  	mutex_init(&mdev->lock);
> 
>  	mdev->dev = dev;
> -	mdev->reg_base = devm_ioremap_resource(dev, io_res);
> +	mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);

Hi Markus:

Thank you for the patch.

Reviewed-by: James Qian Wang (Arm Technology China) <james.qian.wang@....com>


>  	if (IS_ERR(mdev->reg_base)) {
>  		DRM_ERROR("Map register space failed.\n");
>  		err = PTR_ERR(mdev->reg_base);
> --
> 2.23.0