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

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Date:	Wed, 8 Jan 2014 16:58:15 +0530
From:	Roger Quadros <rogerq@...com>
To:	Arnd Bergmann <arnd@...db.de>,
	Kishon Vijay Abraham I <kishon@...com>
CC:	<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 01/08/2014 03:35 PM, Arnd Bergmann wrote:
> 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.

OK.

> 
>>> +     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.

OK. How does this look?

hpriv->phy = devm_phy_get(dev, "sata-phy");
if (IS_ERR(hpriv->phy)) {
	if (PTR_ERR(hpriv->phy) == -ENODEV)
		goto continue;

	dev_err(dev, "couldn't get sata-phy\n");
	rc = PTR_ERR(hpriv->phy);
	goto disable_unprepare_clk;
}

continue:

if (!IS_ERR(hpriv->phy)) {
	rc = phy_init(hpriv->phy);
	if (rc)
		goto disable_unprepare_clk;

	rc = phy_power_on(hpriv->phy);
	if (rc) {
		phy_exit(hpriv->phy);
		goto disable_unprepare_clk;
	}
}

cheers,
-roger

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