linux-kernel - Re: [PATCH -next] drm/sun4i: hdmi: Use PTR_ERR_OR_ZERO in sun4i_tmds

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Date:   Wed, 14 Nov 2018 15:49:30 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH -next] drm/sun4i: hdmi: Use PTR_ERR_OR_ZERO in
 sun4i_tmds_create()

Hi!

On Wed, Nov 07, 2018 at 02:34:23AM +0000, YueHaibing wrote:
> Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR
> 
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> index fb985ba..3d5ee6f 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> @@ -232,8 +232,5 @@ int sun4i_tmds_create(struct sun4i_hdmi *hdmi)
>  	tmds->div_offset = hdmi->variant->tmds_clk_div_offset;
>  
>  	hdmi->tmds_clk = devm_clk_register(hdmi->dev, &tmds->hw);
> -	if (IS_ERR(hdmi->tmds_clk))
> -		return PTR_ERR(hdmi->tmds_clk);
> -
> -	return 0;
> +	return PTR_ERR_OR_ZERO(hdmi->tmds_clk);

While this is technically correct (and I appreciate that this is also
a matter of taste), I find the former syntax to be clearer and easier
to extend if needed.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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