linux-kernel - Re: [PATCH] net/at91_ether: prepare and unprepare clock

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Date:	Mon, 12 Jan 2015 12:08:18 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Cyrille Pitchen <cyrille.pitchen@...el.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net/at91_ether: prepare and unprepare clock

Hi Dave,

This is actually a fix for 3.19, can you take it for the next rc ?

Thanks!

On 08/01/2015 at 11:55:58 +0100, Nicolas Ferre wrote :
> Le 07/01/2015 23:59, Alexandre Belloni a écrit :
> > The clock is enabled without being prepared, this leads to:
> > 
> > WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:889 __clk_enable+0x24/0xa8()
> > 
> > and a non working ethernet interface.
> > 
> > Use clk_prepare_enable() and clk_disable_unprepare() to handle the clock.
> > 
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> 
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> 
> > ---
> >  drivers/net/ethernet/cadence/at91_ether.c | 10 +++++-----
> >  1 file changed, 5 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/cadence/at91_ether.c b/drivers/net/ethernet/cadence/at91_ether.c
> > index 55eb7f2af2b4..7ef55f5fa664 100644
> > --- a/drivers/net/ethernet/cadence/at91_ether.c
> > +++ b/drivers/net/ethernet/cadence/at91_ether.c
> > @@ -340,7 +340,7 @@ static int __init at91ether_probe(struct platform_device *pdev)
> >  		res = PTR_ERR(lp->pclk);
> >  		goto err_free_dev;
> >  	}
> > -	clk_enable(lp->pclk);
> > +	clk_prepare_enable(lp->pclk);
> >  
> >  	lp->hclk = ERR_PTR(-ENOENT);
> >  	lp->tx_clk = ERR_PTR(-ENOENT);
> > @@ -406,7 +406,7 @@ static int __init at91ether_probe(struct platform_device *pdev)
> >  err_out_unregister_netdev:
> >  	unregister_netdev(dev);
> >  err_disable_clock:
> > -	clk_disable(lp->pclk);
> > +	clk_disable_unprepare(lp->pclk);
> >  err_free_dev:
> >  	free_netdev(dev);
> >  	return res;
> > @@ -424,7 +424,7 @@ static int at91ether_remove(struct platform_device *pdev)
> >  	kfree(lp->mii_bus->irq);
> >  	mdiobus_free(lp->mii_bus);
> >  	unregister_netdev(dev);
> > -	clk_disable(lp->pclk);
> > +	clk_disable_unprepare(lp->pclk);
> >  	free_netdev(dev);
> >  
> >  	return 0;
> > @@ -440,7 +440,7 @@ static int at91ether_suspend(struct platform_device *pdev, pm_message_t mesg)
> >  		netif_stop_queue(net_dev);
> >  		netif_device_detach(net_dev);
> >  
> > -		clk_disable(lp->pclk);
> > +		clk_disable_unprepare(lp->pclk);
> >  	}
> >  	return 0;
> >  }
> > @@ -451,7 +451,7 @@ static int at91ether_resume(struct platform_device *pdev)
> >  	struct macb *lp = netdev_priv(net_dev);
> >  
> >  	if (netif_running(net_dev)) {
> > -		clk_enable(lp->pclk);
> > +		clk_prepare_enable(lp->pclk);
> >  
> >  		netif_device_attach(net_dev);
> >  		netif_start_queue(net_dev);
> > 
> 
> 
> -- 
> Nicolas Ferre

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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