linux-kernel - Re: [PATCH v2 3/4] staging: hikey9xx: phy-hi3670-usb3.c: hi3670_is_abbclk

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Date:   Tue, 19 Jan 2021 09:56:31 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, devel@...verdev.osuosl.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yu Chen <chenyu56@...wei.com>,
        Alex Dewar <alex.dewar90@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] staging: hikey9xx: phy-hi3670-usb3.c:
 hi3670_is_abbclk_seleted() returns bool

On Thu, Jan 14, 2021 at 09:56:41AM -0800, Joe Perches wrote:
> On Thu, 2021-01-14 at 18:35 +0100, Mauro Carvalho Chehab wrote:
> > Instead of using 1/0 for true/false, change the type to boolean
> > and change the returned value.
> []
> > diff --git a/drivers/staging/hikey9xx/phy-hi3670-usb3.c b/drivers/staging/hikey9xx/phy-hi3670-usb3.c
> []
> > @@ -326,24 +326,24 @@ static int hi3670_phy_set_params(struct hi3670_priv *priv)
> >  	return ret;
> >  }
> > 
> > -static int hi3670_is_abbclk_seleted(struct hi3670_priv *priv)
> > +static bool hi3670_is_abbclk_seleted(struct hi3670_priv *priv)
> 
> Presumably this should be "selected" not "seleted"
> 
> >  {
> >  	u32 reg;
> > 
> >  	if (!priv->sctrl) {
> >  		dev_err(priv->dev, "priv->sctrl is null!\n");
> > -		return 1;
> > +		return true;
> >  	}
> > 
> >  	if (regmap_read(priv->sctrl, SCTRL_SCDEEPSLEEPED, &reg)) {
> >  		dev_err(priv->dev, "SCTRL_SCDEEPSLEEPED read failed!\n");
> > -		return 1;
> > +		return true;
> >  	}
> > 
> >  	if ((reg & USB_CLK_SELECTED) == 0)
> > -		return 1;
> > +		return true;
> > 
> > -	return 0;
> > +	return false;
> >  }
> 
> 	if (foo)
> 		return true;
> 	return false;
> 
> should generally be consolidated into a single test.

I quite prefer the original format, but you're right about the return
looking reversed.  Using "return !!(reg & USB_CLK_SELECTED);" is
especially problematic.  I like !! but Linus has commented a couple
times that he doesn't like !!.

regards,
dan carpenter