linux-kernel - Re: [PATCH] drm: bridge: dw-hdmi: Remove redundant null check before clk_disable

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Date:   Sun, 20 Dec 2020 20:05:15 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Xu Wang <vulab@...as.ac.cn>
Cc:     a.hajda@...sung.com, narmstrong@...libre.com, jonas@...boo.se,
        jernej.skrabec@...l.net, airlied@...ux.ie, daniel@...ll.ch,
        sam@...nborg.org, boris.brezillon@...labora.com,
        victor.liu@....com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: bridge: dw-hdmi: Remove redundant null check before
 clk_disable_unprepare

Hi Xu Wang,

Thank you for the patch.

On Fri, Nov 27, 2020 at 09:23:32AM +0000, Xu Wang wrote:
> Because clk_disable_unprepare() already checked NULL clock parameter,
> so the additional check is unnecessary, just remove them.
> 
> Signed-off-by: Xu Wang <vulab@...as.ac.cn>

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

> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 0c79a9ba48bb..dda4fa9a1a08 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -3440,8 +3440,7 @@ struct dw_hdmi *dw_hdmi_probe(struct platform_device *pdev,
>  
>  err_iahb:
>  	clk_disable_unprepare(hdmi->iahb_clk);
> -	if (hdmi->cec_clk)
> -		clk_disable_unprepare(hdmi->cec_clk);
> +	clk_disable_unprepare(hdmi->cec_clk);
>  err_isfr:
>  	clk_disable_unprepare(hdmi->isfr_clk);
>  err_res:
> @@ -3465,8 +3464,7 @@ void dw_hdmi_remove(struct dw_hdmi *hdmi)
>  
>  	clk_disable_unprepare(hdmi->iahb_clk);
>  	clk_disable_unprepare(hdmi->isfr_clk);
> -	if (hdmi->cec_clk)
> -		clk_disable_unprepare(hdmi->cec_clk);
> +	clk_disable_unprepare(hdmi->cec_clk);
>  
>  	if (hdmi->i2c)
>  		i2c_del_adapter(&hdmi->i2c->adap);

-- 
Regards,

Laurent Pinchart