linux-kernel - Re: [PATCH v4] IBM power meter driver

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Date:	Tue, 09 Oct 2007 18:44:07 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	"Mark M. Hoffman" <mhoffman@...htlink.com>
CC:	"Darrick J. Wong" <djwong@...ibm.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	haveblue@...ibm.com
Subject: Re: [PATCH v4] IBM power meter driver

Mark M. Hoffman wrote:
>> +static void ibmpex_register_bmc(int iface, struct device *dev)
>> +{
>> +	struct ibmpex_bmc_data *data;
>> +	int err;
>> +
>> +	data = kzalloc(sizeof(*data), GFP_KERNEL);
>> +	if (!data) {
>> +		printk(KERN_ERR DRVNAME ": Insufficient memory for BMC "
>> +		       "interface %d.\n", data->interface);
>> +		return;
>> +	}
>> +
>> +	data->address.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE;
>> +	data->address.channel = IPMI_BMC_CHANNEL;
>> +	data->address.data[0] = 0;
>> +	data->interface = iface;
>> +	data->bmc_device = dev;
>> +
>> +	/* Create IPMI messaging interface user */
>> +	err = ipmi_create_user(data->interface, &driver_data.ipmi_hndlrs,
>> +			       data, &data->user);
>> +	if (err < 0) {
>> +		printk(KERN_ERR DRVNAME ": Error, unable to register user with "
>> +		       "ipmi interface %d\n",
>> +		       data->interface);
>> +		goto out;
>> +	}
>> +
>> +	mutex_init(&data->lock);
>> +
>> +	/* Initialize message */
>> +	data->tx_msgid = 0;
>> +	init_completion(&data->read_complete);
>> +	data->tx_message.netfn = PEX_NET_FUNCTION;
>> +	data->tx_message.cmd = PEX_COMMAND;
>> +	data->tx_message.data = data->tx_msg_data;
>> +
>> +	/* Does this BMC support PowerExecutive? */
>> +	err = ibmpex_ver_check(data);
>> +	if (err)
>> +		goto out_user;
>> +
>> +	/* Register the BMC as a HWMON class device */
>> +	data->hwmon_dev = hwmon_device_register(data->bmc_device);
>> +
>> +	if (IS_ERR(data->hwmon_dev)) {
>> +		printk(KERN_ERR DRVNAME ": Error, unable to register hwmon "
>> +		       "class device for interface %d\n",
>> +		       data->interface);
>> +		kfree(data);
>> +		return;

don't you want to goto out_user here instead?

>> +	}
>> +
>> +	/* finally add the new bmc data to the bmc data list */
>> +	dev_set_drvdata(dev, data);
>> +	list_add_tail(&data->list, &driver_data.bmc_data);
>> +
>> +	/* Now go find all the sensors */
>> +	err = ibmpex_find_sensors(data);
>> +	if (err) {
>> +		printk(KERN_ERR "Error %d allocating memory\n", err);
>> +		goto out_register;
>> +	}
>> +
>> +	return;
>> +
>> +out_register:
>> +	hwmon_device_unregister(data->hwmon_dev);
>> +out_user:
>> +	ipmi_destroy_user(data->user);
>> +out:
>> +	kfree(data);
>> +}


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