linux-kernel - Re: [PATCH] omapfb/dss: Remove redundant null check before clk_prepare_enable/clk_disable

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Message-ID: <20201015100827.1115fa9b@linux-uq9g>
Date:   Thu, 15 Oct 2020 10:08:27 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Xu Wang <vulab@...as.ac.cn>
Cc:     b.zolnierkie@...sung.com, pakki001@....edu, yuehaibing@...wei.com,
        linux-fbdev@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] omapfb/dss: Remove redundant null check before
 clk_prepare_enable/clk_disable_unprepare

On Wed, 14 Oct 2020 08:49:20 +0000 Xu Wang <vulab@...as.ac.cn> wrote:

> Because clk_prepare_enable() and clk_disable_unprepare() already checked
> NULL clock parameter, so the additional checks are unnecessary, just
> remove them.
> 
> Signed-off-by: Xu Wang <vulab@...as.ac.cn>

Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
>  drivers/video/fbdev/omap2/omapfb/dss/venc.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/venc.c
> b/drivers/video/fbdev/omap2/omapfb/dss/venc.c index
> 0b0ad20afd63..8895fb8493d8 100644 ---
> a/drivers/video/fbdev/omap2/omapfb/dss/venc.c +++
> b/drivers/video/fbdev/omap2/omapfb/dss/venc.c @@ -890,8 +890,7 @@ static
> int venc_remove(struct platform_device *pdev) 
>  static int venc_runtime_suspend(struct device *dev)
>  {
> -	if (venc.tv_dac_clk)
> -		clk_disable_unprepare(venc.tv_dac_clk);
> +	clk_disable_unprepare(venc.tv_dac_clk);
>  
>  	dispc_runtime_put();
>  
> @@ -906,8 +905,7 @@ static int venc_runtime_resume(struct device *dev)
>  	if (r < 0)
>  		return r;
>  
> -	if (venc.tv_dac_clk)
> -		clk_prepare_enable(venc.tv_dac_clk);
> +	clk_prepare_enable(venc.tv_dac_clk);
>  
>  	return 0;
>  }



-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer