linux-kernel - Re: [PATCHv2 1/2] remove redundant struct clk NULL checks

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Message-ID: <1452612358.3694.44.camel@pengutronix.de>
Date:	Tue, 12 Jan 2016 16:25:58 +0100
From:	Lucas Stach <l.stach@...gutronix.de>
To:	Lothar Waßmann <LW@...O-electronics.de>
Cc:	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Greg Ungerer <gerg@...inux.org>,
	Kevin Hao <haokexin@...il.com>,
	Nimrod Andy <B38611@...escale.com>,
	Philippe Reynes <tremyfr@...il.com>,
	Richard Cochran <richardcochran@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Stefan Agner <stefan@...er.ch>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv2 1/2] remove redundant struct clk NULL checks

Am Dienstag, den 12.01.2016, 16:17 +0100 schrieb Lothar Waßmann:
> NULL is a valid argument to clk_enable()/clk_disable(). Remove
> redundant checks before calling those functions.
> 
> Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  drivers/net/ethernet/freescale/fec_main.c | 23 +++++++++--------------
>  1 file changed, 9 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
> index 502da6f..592a7a4 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -1874,35 +1874,30 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable)
>  			}
>  			mutex_unlock(&fep->ptp_clk_mutex);
>  		}
> -		if (fep->clk_ref) {
> -			ret = clk_prepare_enable(fep->clk_ref);
> -			if (ret)
> -				goto failed_clk_ref;
> -		}
> +
> +		ret = clk_prepare_enable(fep->clk_ref);
> +		if (ret)
> +			goto failed_clk_ref;
>  	} else {
>  		clk_disable_unprepare(fep->clk_ahb);
> -		if (fep->clk_enet_out)
> -			clk_disable_unprepare(fep->clk_enet_out);
> +		clk_disable_unprepare(fep->clk_enet_out);
>  		if (fep->clk_ptp) {
>  			mutex_lock(&fep->ptp_clk_mutex);
>  			clk_disable_unprepare(fep->clk_ptp);
>  			fep->ptp_clk_on = false;
>  			mutex_unlock(&fep->ptp_clk_mutex);
>  		}
> -		if (fep->clk_ref)
> -			clk_disable_unprepare(fep->clk_ref);
> +		clk_disable_unprepare(fep->clk_ref);
>  	}
>  
>  	return 0;
>  
>  failed_clk_ref:
> -	if (fep->clk_ref)
> -		clk_disable_unprepare(fep->clk_ref);
> +	clk_disable_unprepare(fep->clk_ref);
>  failed_clk_ptp:
> -	if (fep->clk_enet_out)
> -		clk_disable_unprepare(fep->clk_enet_out);
> +	clk_disable_unprepare(fep->clk_enet_out);
>  failed_clk_enet_out:
> -		clk_disable_unprepare(fep->clk_ahb);
> +	clk_disable_unprepare(fep->clk_ahb);
>  
>  	return ret;
>  }

-- 
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