linux-kernel - Re: [PATCH v1 5/6] usb: otg: add device tree support to otg library

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Date:	Tue, 22 Jan 2013 21:07:44 +0530
From:	kishon <kishon@...com>
To:	Mark Rutland <mark.rutland@....com>
CC:	"tony@...mide.com" <tony@...mide.com>,
	"balbi@...com" <balbi@...com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"eballetbo@...il.com" <eballetbo@...il.com>,
	"javier@...hile0.org" <javier@...hile0.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: Re: [PATCH v1 5/6] usb: otg: add device tree support to otg library

Hi,

On Tuesday 22 January 2013 04:06 PM, Mark Rutland wrote:
>> +struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
>> +	const char *phandle, u8 index)
>> +{
>> +	struct usb_phy	*phy = NULL, **ptr;
>> +	unsigned long	flags;
>> +	struct device_node *node;
>> +
>> +	if (!dev->of_node) {
>> +		dev_dbg(dev, "device does not have a device node entry\n");
>> +		return ERR_PTR(-EINVAL);
>> +	}
>> +
>> +	node = of_parse_phandle(dev->of_node, phandle, index);
>> +	if (!node) {
>> +		dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
>> +			dev->of_node->full_name);
>> +		return ERR_PTR(-ENODEV);
>> +	}
>
> At any point past this, node's refcount is incremented (done automatically by
> of_parse_phandle => of_find_node_by_phandle).
>
>> +
>> +	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
>> +	if (!ptr) {
>> +		dev_dbg(dev, "failed to allocate memory for devres\n");
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +
>> +	spin_lock_irqsave(&phy_lock, flags);
>> +
>> +	phy = __of_usb_find_phy(node);
>> +	if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
>> +		phy = ERR_PTR(-EPROBE_DEFER);
>> +		devres_free(ptr);
>> +		goto err0;
>> +	}
>> +
>> +	*ptr = phy;
>> +	devres_add(dev, ptr);
>> +
>> +	get_device(phy->dev);
>> +
>> +err0:
>> +	spin_unlock_irqrestore(&phy_lock, flags);
>> +
>> +	return phy;
>> +}
>
> This means that on all of the exit paths, node's refcount is left incremented
> incorrectly. You'll need an of_node_put(node) on each exit path.

Ok. Will fix it.

Thanks
Kishon
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