linux-kernel - Re: [PATCH v3 2/3] net: Add Keystone NetCP ethernet driver

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Date:	Tue, 16 Sep 2014 09:44:59 -0400
From:	Sandeep Nair <sandeep_n@...com>
To:	David Miller <davem@...emloft.net>, <santosh.shilimkar@...com>
CC:	<netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <robh+dt@...nel.org>,
	<grant.likely@...aro.org>, <devicetree@...r.kernel.org>,
	<jhs@...atatu.com>
Subject: Re: [PATCH v3 2/3] net: Add Keystone NetCP ethernet driver

On 9/15/2014 12:37 PM, David Miller wrote:
> From: Santosh Shilimkar <santosh.shilimkar@...com>
> Date: Sat, 13 Sep 2014 16:07:18 -0400
>
>> +	/* Find this module in the sub-tree for this device */
>> +	devices = of_get_child_by_name(node, "netcp-devices");
>> +	if (!devices) {
>> +		dev_err(dev, "could not find netcp-devices node\n");
>> +		return NETCP_MOD_PROBE_SKIPPED;
>> +	}
>> +
>> +	for_each_available_child_of_node(devices, child) {
>> +		const char *name = netcp_node_name(child);
>> +
>> +		if (!strcasecmp(module->name, name))
>> +			break;
>> +	}
>> +
>> +	/* If module not used for this device, skip it */
>> +	if (child == NULL) {
>> +		dev_warn(dev, "module(%s) not used for device\n", module->name);
>> +		return NETCP_MOD_PROBE_SKIPPED;
>> +	}
>
> of_get_child_by_name() takes a reference to an OF node, you must release
> it in the error path.
>
Will fix this.
>> +	inst_modpriv = devm_kzalloc(dev, sizeof(*inst_modpriv), GFP_KERNEL);
>> +	if (!inst_modpriv) {
>> +		dev_err(dev, "Failed to allocate instance for %s\n",
>> +			module->name);
>> +		return -ENOMEM;
>> +	}
>
> Likewise, but here you have to release both "devices" and "child".
>
> You're going to have to fix this OF node refcount problem for this
> entire probe routine.
>
Will do.

Thanks for the review David!

Regards
Sandeep

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