[PATCH] usb: phy: samsung: Introducing usb phy driver for hsotg

[Russell King - ARM Linux]

On Wed, Oct 17, 2012 at 08:00:00PM +0900, Kukjin Kim wrote:
> > +static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
> > +{
> > +	struct clk *ref_clk;
> > +	int refclk_freq = 0;
> > +
> > +	ref_clk = clk_get(sphy->dev, "xusbxti");
> > +	if (IS_ERR(ref_clk)) {
> 
> IS_ERR_OR_NULL(ref_clk)?

For the N'th time, NO.  IS_ERR is correct here.

> > +		dev_err(sphy->dev, "Failed to get reference clock\n");
> > +		return PTR_ERR(ref_clk);

Look, it's the ABI.  Not only that but it's also TOTALLY AND UTTERLY WRONG
to use IS_ERR_OR_NULL(foo) and then follow it with return PTR_ERR(foo).
You end up returning ZERO.

Stop telling people to use IS_ERR_OR_NULL without properly thinking about
it first.  Virtually every single one of these done this way is a BUG.

Are we clear on this?