linux-kernel - Re: [PATCH v3 01/11] usb: phy: Add APIs for runtime power management

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Message-ID: <20130402121048.GA9488@arwen.pp.htv.fi>
Date:	Tue, 2 Apr 2013 15:10:48 +0300
From:	Felipe Balbi <balbi@...com>
To:	Vivek Gautam <gautamvivek1987@...il.com>
CC:	<balbi@...com>, Vivek Gautam <gautam.vivek@...sung.com>,
	<linux-usb@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>,
	<sarah.a.sharp@...ux.intel.com>, <rob.herring@...xeda.com>,
	<kgene.kim@...sung.com>, <kishon@...com>, <dianders@...omium.org>,
	<t.figa@...sung.com>, <p.paneri@...sung.com>
Subject: Re: [PATCH v3 01/11] usb: phy: Add APIs for runtime power management

Hi,

On Tue, Apr 02, 2013 at 04:04:01PM +0530, Vivek Gautam wrote:
> > On Mon, Apr 01, 2013 at 07:24:00PM +0530, Vivek Gautam wrote:
> >> Adding  APIs to handle runtime power management on PHY
> >> devices. PHY consumers may need to wake-up/suspend PHYs
> >> when they work across autosuspend.
> >>
> >> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> >> ---
> >>  include/linux/usb/phy.h |  141 +++++++++++++++++++++++++++++++++++++++++++++++
> >>  1 files changed, 141 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
> >> index 6b5978f..01bf9c1 100644
> >> --- a/include/linux/usb/phy.h
> >> +++ b/include/linux/usb/phy.h
> >> @@ -297,4 +297,145 @@ static inline const char *usb_phy_type_string(enum usb_phy_type type)
> >>               return "UNKNOWN PHY TYPE";
> >>       }
> >>  }
> >> +
> >> +static inline void usb_phy_autopm_enable(struct usb_phy *x)
> >> +{
> >> +     if (!x || !x->dev) {
> >> +             dev_err(x->dev, "no PHY or attached device available\n");
> >> +             return;
> >> +             }
> >
> > wrong indentation, also, I'm not sure we should allow calls with NULL
> > pointers. Perhaps a WARN() so we get API offenders early enough ?
> 
> True, bad coding style :-(
> We should be handling dev_err with a NULL pointer.
> Will just keep here:
> if (WARN_ON(!x->dev))
>       return .... ;

right, but I guess:

if (WARN(!x || !x->dev, "Invalid parameters\n"))
	return -EINVAL;

would be better ??

-- 
balbi

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