linux-kernel - Re: [PATCHv2 2/3] usb: ehci-platform: Use devm_of_phy_get_by

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Date:	Wed, 15 Apr 2015 10:36:46 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	rajeev kumar <rajeevkumar.linux@...il.com>
cc:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Tony Prisk <linux@...sktech.co.nz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Paul Bolle <pebolle@...cali.nl>,
	Thomas Pugliese <thomas.pugliese@...il.com>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	David Mosberger <davidm@...uge.net>,
	Peter Griffin <peter.griffin@...aro.org>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Kevin Hao <haokexin@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazau <anatol@...gle.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCHv2 2/3] usb: ehci-platform: Use devm_of_phy_get_by_index

On Wed, 15 Apr 2015, rajeev kumar wrote:

> > @@ -88,15 +88,13 @@ static int ehci_platform_power_on(struct platform_device *dev)
> >         }
> >
> >         for (phy_num = 0; phy_num < priv->num_phys; phy_num++) {
> > -               if (priv->phys[phy_num]) {
> > -                       ret = phy_init(priv->phys[phy_num]);
> > -                       if (ret)
> > -                               goto err_exit_phy;
> > -                       ret = phy_power_on(priv->phys[phy_num]);
> > -                       if (ret) {
> > -                               phy_exit(priv->phys[phy_num]);
> > -                               goto err_exit_phy;
> > -                       }
> > +               ret = phy_init(priv->phys[phy_num]);
> > +               if (ret)
> > +                       goto err_exit_phy;
> 
> Jumping to err_exit_phy will perform phy_power_off also which is not
> required as you are are powering on after phy_init. Wrong level
> jumping

Look again, and this time pay more attention to the value of phy_num.

Alan Stern

> ~Rajeev
> 
> > +               ret = phy_power_on(priv->phys[phy_num]);
> > +               if (ret) {
> > +                       phy_exit(priv->phys[phy_num]);
> > +                       goto err_exit_phy;
> >                 }
> >         }
> >
> > @@ -104,10 +102,8 @@ static int ehci_platform_power_on(struct platform_device *dev)
> >
> >  err_exit_phy:
> >         while (--phy_num >= 0) {
> > -               if (priv->phys[phy_num]) {
> > -                       phy_power_off(priv->phys[phy_num]);
> > -                       phy_exit(priv->phys[phy_num]);
> > -               }
> > +               phy_power_off(priv->phys[phy_num]);
> > +               phy_exit(priv->phys[phy_num]);
> >         }


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