[PATCH 3/5] drm/msm: Fix IS_ERR_OR_NULL() vs NULL check in msm_icc_get()

[Marijn Suijten]

On 2022-11-10 17:44:43, Gaosheng Cui wrote:
> The of_icc_get() function returns NULL or error pointers on error path,
> so we should use IS_ERR_OR_NULL() to check the return value.
> 
> Fixes: 5ccdcecaf8f7 ("drm/msm: lookup the ICC paths in both mdp5/dpu and mdss devices")
> Signed-off-by: Gaosheng Cui <cuigaosheng1 at huawei.com>
> ---
>  drivers/gpu/drm/msm/msm_io_utils.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_io_utils.c b/drivers/gpu/drm/msm/msm_io_utils.c
> index d02cd29ce829..950083b2f092 100644
> --- a/drivers/gpu/drm/msm/msm_io_utils.c
> +++ b/drivers/gpu/drm/msm/msm_io_utils.c
> @@ -133,7 +133,7 @@ struct icc_path *msm_icc_get(struct device *dev, const char *name)
>  	struct icc_path *path;
>  
>  	path = of_icc_get(dev, name);
> -	if (path)
> +	if (IS_ERR_OR_NULL(path))

NAK. This path should be returned if it is NON-NULL, otherwise we defer
to of_icc_get() on the parent device.  See the code-comment below.

- Marijn

>  		return path;
>  
>  	/*
> -- 
> 2.25.1
>