linux-kernel - Re: [RFC PATCH 1/3] ACPIHP: introduce a framework for ACPI based system device hotplug

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Date:	Thu, 2 Aug 2012 15:07:44 +0800
From:	Jiang Liu <jiang.liu@...wei.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	Jiang Liu <liuj97@...il.com>, Len Brown <lenb@...nel.org>,
	Tony Luck <tony.luch@...el.com>,
	Bob Moore <robert.moore@...el.com>,
	Huang Ying <ying.huang@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, Gaohuai Han <hangaohuai@...wei.com>
Subject: Re: [RFC PATCH 1/3] ACPIHP: introduce a framework for ACPI based
 system device hotplug

On 2012-8-2 15:07, Tang Chen wrote:
> Hi,
> 
> A little problem here. :)
> 
> On 07/28/2012 07:42 PM, Jiang Liu wrote:
>> +int acpihp_register_slot(struct acpihp_slot *slot)
>> +{
>> +	int ret;
>> +	char *name;
>> +	size_t off;
>> +
>> +	if (!slot || !slot->slot_ops)
>> +		return -EINVAL;
>> +
>> +	/* Hook top level hotplug slots under ACPI root device */
>> +	if (slot->parent)
>> +		slot->dev.parent = &slot->parent->dev;
>> +	else
>> +		slot->dev.parent = &acpi_root->dev;
>> +
>> +	ret = device_add(&slot->dev);
>> +	if (!ret) {
>> +		slot->flags |= ACPIHP_SLOT_FLAG_REGISTERED;
>> +		name = kmalloc(PAGE_SIZE, GFP_KERNEL);
>> +		if (name) {
>> +			off = acpihp_generate_link_name(slot, name, 0);
>> +			name[off - 1] = '\0';
>> +			sysfs_create_link(&acpihp_slot_kset->kobj,
>> +					  &slot->dev.kobj, name);
> 
> I got a compiler warning here:
>   CC      drivers/acpi/hotplug/core.o
> drivers/acpi/hotplug/core.c: In function ‘acpihp_register_slot’:
> drivers/acpi/hotplug/core.c:199: warning: ignoring return value of ‘sysfs_create_link’, declared with attribute warn_unused_result
> 
> Seems that we need to check the sysfs_create_link()'s return value here, and if it fails, 
> shall we at least give a warning message here ?
> 
> Thanks. :)
Hi Tang,
	Thanks for your comments, will fix it in next version.
	Regards!
	Gerry

> 
> 
>> +			kfree(name);
>> +		}
>> +	}
>> +
>> +	return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(acpihp_register_slot);
> 


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