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Date:   Fri, 16 Oct 2020 12:56:25 +0200
From:   Thomas Zimmermann <tzimmermann@suse.de>
To:     Xu Wang <vulab@iscas.ac.cn>
Cc:     linux-fbdev@vger.kernel.org, arnd@arndb.de,
        b.zolnierkie@samsung.com, jani.nikula@intel.com,
        daniel.vetter@ffwll.ch, gustavoars@kernel.org,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] video: fbdev: sh_mobile_lcdcfb: Remove redundant null
 check before clk_prepare_enable/clk_disable_unprepare
Message-ID: <20201016125625.7d2b5bd7@linux-uq9g>
In-Reply-To: <20201015101015.6dbd25ce@linux-uq9g>
References: <20201014085722.26069-1-vulab@iscas.ac.cn>
        <20201015101015.6dbd25ce@linux-uq9g>
Organization: SUSE Software Solutions Germany GmbH
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On Thu, 15 Oct 2020 10:10:15 +0200 Thomas Zimmermann <tzimmermann@suse.de>
wrote:

> On Wed, 14 Oct 2020 08:57:22 +0000 Xu Wang <vulab@iscas.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@iscas.ac.cn>
> 
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> 

Merged into drm-misc-next. Thanks!

> > ---
> >  drivers/video/fbdev/sh_mobile_lcdcfb.c | 6 ++----
> >  1 file changed, 2 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c
> > b/drivers/video/fbdev/sh_mobile_lcdcfb.c index c1043420dbd3..c0952cc96bdb
> > 100644 --- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
> > +++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
> > @@ -341,8 +341,7 @@ static void lcdc_wait_bit(struct sh_mobile_lcdc_priv
> > *priv, static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
> >  {
> >  	if (atomic_inc_and_test(&priv->hw_usecnt)) {
> > -		if (priv->dot_clk)
> > -			clk_prepare_enable(priv->dot_clk);
> > +		clk_prepare_enable(priv->dot_clk);
> >  		pm_runtime_get_sync(priv->dev);
> >  	}
> >  }
> > @@ -351,8 +350,7 @@ static void sh_mobile_lcdc_clk_off(struct
> > sh_mobile_lcdc_priv *priv) {
> >  	if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
> >  		pm_runtime_put(priv->dev);
> > -		if (priv->dot_clk)
> > -			clk_disable_unprepare(priv->dot_clk);
> > +		clk_disable_unprepare(priv->dot_clk);
> >  	}
> >  }
> >  
> 
> 
> 


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