linux-kernel - Re: [PATCH 1/3] net: fec: Remove redundant checks for NULL clk pointer

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Message-ID: <20151201082416.4ce7dd4c@ipc1.ka-ro>
Date:	Tue, 1 Dec 2015 08:24:16 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Duan Andy <fugang.duan@...escale.com>
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>,
	Lucas Stach <l.stach@...gutronix.de>,
	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" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	"Uwe Kleine-K?nig" <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 1/3] net: fec: Remove redundant checks for NULL clk
 pointer

Hi,

> From: Lothar Waßmann <LW@...O-electronics.de> Sent: Monday, November 30, 2015 7:33 PM
> > To: Andrew Lunn; David S. Miller; Estevam Fabio-R49496; Greg Ungerer;
> > Kevin Hao; Lothar Waßmann; Lucas Stach; Duan Fugang-B38611; Philippe
> > Reynes; Richard Cochran; Russell King; Sascha Hauer; Stefan Agner; linux-
> > kernel@...r.kernel.org; netdev@...r.kernel.org; Jeff Kirsher; Uwe Kleine-
> > König
> > Subject: [PATCH 1/3] net: fec: Remove redundant checks for NULL clk
> > pointer
> > 
> > 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>
> > ---
> >  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 d2328fc..e17d74f 100644
> > --- a/drivers/net/ethernet/freescale/fec_main.c
> > +++ b/drivers/net/ethernet/freescale/fec_main.c
> > @@ -1873,35 +1873,30 @@ 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;
> 
> If you want to clean up the code, pls also remove "fep->clk_enet_out" check in this brace.
> 
I would have to reintroduce it in the later patch to frame the call to
fec_reset_phy().


Lothar Waßmann
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