linux-kernel - Re: [PATCH -next] drm/shmob: Fix return value check in shmob_drm

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Date:   Mon, 17 Dec 2018 23:36:39 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     kieran.bingham+renesas@...asonboard.com, airlied@...ux.ie,
        daniel@...ll.ch, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH -next] drm/shmob: Fix return value check in shmob_drm_probe

Hi Yue,

Thank you for the patch.

On Monday, 17 December 2018 11:18:30 EET YueHaibing wrote:
> In case of error, the function devm_ioremap_resource() returns ERR_PTR()
> and never returns NULL. The NULL test in the return value check should
> be replaced with IS_ERR().
> 
> Fixes: 8f1597c8f1a5 ("drm: shmobile: Perform initialization/cleanup at
> probe/remove time")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

and applied to my tree.

> ---
>  drivers/gpu/drm/shmobile/shmob_drm_drv.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> b/drivers/gpu/drm/shmobile/shmob_drm_drv.c index 8554102..f2cfd16 100644
> --- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> +++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
> @@ -229,8 +229,8 @@ static int shmob_drm_probe(struct platform_device *pdev)
> 
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
> -	if (sdev->mmio == NULL)
> -		return -ENOMEM;
> +	if (IS_ERR(sdev->mmio))
> +		return PTR_ERR(sdev->mmio);
> 
>  	ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
>  	if (ret < 0)

-- 
Regards,

Laurent Pinchart