[PATCH -next] drm/rcar-du: Fix return value check in rcar_du_cmm_init()

[Jacopo Mondi]

Hello Wei,

On Tue, Apr 28, 2020 at 02:17:16PM +0000, Wei Yongjun wrote:
> In case of error, the function of_parse_phandle()/of_find_device_by_node()
> returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value
> check should be replaced with NULL test
>
> Fixes: 8de707aeb452 ("drm: rcar-du: kms: Initialize CMM instances")
> Signed-off-by: Wei Yongjun <weiyongjun1 at huawei.com>

Correct indeed! Also -ENODEV seems appropriate to me as return value.
Thanks!

Acked-by: Jacopo Mondi <jacopo+renesas at jmondi.org>

> ---
>  drivers/gpu/drm/rcar-du/rcar_du_kms.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> index 482329102f19..0da711d9b2f8 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
> @@ -650,10 +650,10 @@ static int rcar_du_cmm_init(struct rcar_du_device *rcdu)
>  		int ret;
>
>  		cmm = of_parse_phandle(np, "renesas,cmms", i);
> -		if (IS_ERR(cmm)) {
> +		if (!cmm) {
>  			dev_err(rcdu->dev,
>  				"Failed to parse 'renesas,cmms' property\n");
> -			return PTR_ERR(cmm);
> +			return -ENODEV;
>  		}
>
>  		if (!of_device_is_available(cmm)) {
> @@ -663,10 +663,10 @@ static int rcar_du_cmm_init(struct rcar_du_device *rcdu)
>  		}
>
>  		pdev = of_find_device_by_node(cmm);
> -		if (IS_ERR(pdev)) {
> +		if (!pdev) {
>  			dev_err(rcdu->dev, "No device found for CMM%u\n", i);
>  			of_node_put(cmm);
> -			return PTR_ERR(pdev);
> +			return -ENODEV;
>  		}
>
>  		of_node_put(cmm);
>
>
>