linux-kernel - Re: [PATCH V3 07/12] ata/sata_mv: Remove conditional compilation of clk code

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Date:	Tue, 24 Apr 2012 14:51:00 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Viresh Kumar <viresh.kumar@...com>, mturquette@...aro.org,
	sshtylyov@...sta.com, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	viresh.linux@...il.com, linux@....linux.org.uk,
	akpm@...ux-foundation.org, jgarzik@...hat.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V3 07/12] ata/sata_mv: Remove conditional compilation of
 clk code

Hi,

Andrew Lunn writes:
> > -#if defined(CONFIG_HAVE_CLK)
> >  	hpriv->clk = clk_get(&pdev->dev, NULL);
> > -	if (IS_ERR(hpriv->clk))
> > -		dev_notice(&pdev->dev, "cannot get clkdev\n");
> > -	else
> > -		clk_enable(hpriv->clk);
> > -#endif
> > +	if (IS_ERR(hpriv->clk)) {
> > +		dev_err(&pdev->dev, "cannot get clkdev\n");
> > +		return PTR_ERR(hpriv->clk);
> > +	}
> > +
> > +	clk_enable(hpriv->clk);
> 
> Sorry, but still wrong.
> 
> The clock is optional. If we can find a clock, turn it on. If not,
> keep going....
> 
> You patch causes the missing clock to become a fatal error.
> 
The clock API should accept NULL pointers as valid clocks and
treat them as NOP.
Thus drivers wouldn't have to worry about whether they actually got a
clock to manage or if their clocks are just dummies.


Lothar Waßmann
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