linux-kernel - Re: [PATCH v3 2/3] ata: ahci

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Date:	Wed, 08 Jan 2014 11:05:07 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Roger Quadros <rogerq@...com>, tj@...nel.org,
	sergei.shtylyov@...entembedded.com, b.zolnierkie@...sung.com,
	hdegoede@...hat.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Balaji T K <balajitk@...com>
Subject: Re: [PATCH v3 2/3] ata: ahci_platform: Manage SATA PHY

On Wednesday 08 January 2014 15:29:18 Kishon Vijay Abraham I wrote:
> > +     hpriv->phy = devm_phy_get(dev, "sata-phy");
> > +     if (IS_ERR(hpriv->phy)) {
> > +             dev_dbg(dev, "can't get sata-phy\n");
> > +             /* return only if -EPROBE_DEFER */
> > +             if (PTR_ERR(hpriv->phy) == -EPROBE_DEFER) {
> > +                     rc = -EPROBE_DEFER;
> > +                     goto disable_unprepare_clk;
> > +             }
> > +     }

This should probably check for all errors except "not present"
rather than checking for -EPROBE_DEFER. We want to abort the
probe function for deferred probe as well as the case where we
a PHY was listed but isn't working properly.

> > +     if (!IS_ERR(hpriv->phy)) {
> > +             phy_init(hpriv->phy);
> 
> Don't we have to check the return values of phy_init and phy_power_on? Is it
> not needed because it is an optional phy?

Right. I think we should set hpriv->phy to NULL if it's not there and
then call the functions only if it's actually present but bail out on
an error.

	Arnd
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