linux-kernel - Re: [PATCH v2] i7core_edac: release resources on error in i7core_create_sysfs

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Message-ID: <BLU436-SMTP974EFE8FECFB5C551C1488953D0@phx.gbl>
Date:	Tue, 3 Feb 2015 13:56:16 +0800
From:	Junjie Mao <junjie.mao@...mail.com>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Doug Thompson <dougthompson@...ssion.com>,
	Borislav Petkov <bp@...en8.de>, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i7core_edac: release resources on error in i7core_create_sysfs_devices

Guenter Roeck <linux@...ck-us.net> writes:

> On Tue, Feb 03, 2015 at 10:40:14AM +0800, Junjie Mao wrote:
>> v2: do not call kfree on allocated devs after device_initialize is called
>> 
>> Signed-off-by: Junjie Mao <junjie.mao@...mail.com>
>> ---
>>  drivers/edac/i7core_edac.c | 37 +++++++++++++++++++++++++------------
>>  1 file changed, 25 insertions(+), 12 deletions(-)
>> 
>> diff --git a/drivers/edac/i7core_edac.c b/drivers/edac/i7core_edac.c
>> index 9cd0b301f81b..f6a7b676d69c 100644
>> --- a/drivers/edac/i7core_edac.c
>> +++ b/drivers/edac/i7core_edac.c
>> @@ -1167,17 +1167,17 @@ static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
>>  		return rc;
>>  	rc = device_create_file(&mci->dev, &dev_attr_inject_type);
>>  	if (rc < 0)
>> -		return rc;
>> +		goto fail_remove_inject_section;
>>  	rc = device_create_file(&mci->dev, &dev_attr_inject_eccmask);
>>  	if (rc < 0)
>> -		return rc;
>> +		goto fail_remove_inject_type;
>>  	rc = device_create_file(&mci->dev, &dev_attr_inject_enable);
>>  	if (rc < 0)
>> -		return rc;
>> +		goto fail_remove_inject_eccmask;
>> 
>>  	pvt->addrmatch_dev = kzalloc(sizeof(*pvt->addrmatch_dev), GFP_KERNEL);
>>  	if (!pvt->addrmatch_dev)
>> -		return rc;
>> +		goto fail_remove_inject_enable;
>> 
>>  	pvt->addrmatch_dev->type = &addrmatch_type;
>>  	pvt->addrmatch_dev->bus = mci->dev.bus;
>> @@ -1190,16 +1190,13 @@ static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
>> 
>>  	rc = device_add(pvt->addrmatch_dev);
>>  	if (rc < 0)
>> -		return rc;
>> +		goto fail_free_addrmatch_dev;
>> 
>>  	if (!pvt->is_registered) {
>>  		pvt->chancounts_dev = kzalloc(sizeof(*pvt->chancounts_dev),
>>  					      GFP_KERNEL);
>> -		if (!pvt->chancounts_dev) {
>> -			put_device(pvt->addrmatch_dev);
>> -			device_del(pvt->addrmatch_dev);
>> -			return rc;
>> -		}
>> +		if (!pvt->chancounts_dev)
>> +			goto fail_del_addrmatch_dev;
>> 
>>  		pvt->chancounts_dev->type = &all_channel_counts_type;
>>  		pvt->chancounts_dev->bus = mci->dev.bus;
>> @@ -1211,10 +1208,26 @@ static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
>>  		edac_dbg(1, "creating %s\n", dev_name(pvt->chancounts_dev));
>> 
>>  		rc = device_add(pvt->chancounts_dev);
>> -		if (rc < 0)
>> -			return rc;
>> +		if (rc < 0) {
>> +			put_device(pvt->chancounts_dev);
>> +			goto fail_del_addrmatch_dev;
>> +		}
>>  	}
>>  	return 0;
>> +
>> +fail_del_addrmatch_dev:
>> +	device_del(pvt->addrmatch_dev);
>> +fail_free_addrmatch_dev:
>> +	put_device(pvt->addrmatch_dev);
>> +fail_remove_inject_enable:
>> +	device_create_file(&mci->dev, &dev_attr_inject_enable);
>> +fail_remove_inject_eccmask:
>> +	device_create_file(&mci->dev, &dev_attr_inject_eccmask);
>> +fail_remove_inject_type:
>> +	device_create_file(&mci->dev, &dev_attr_inject_type);
>> +fail_remove_inject_section:
>> +	device_create_file(&mci->dev, &dev_attr_inject_section);
>
> I don't know the code, but calling device_create_file() on failures
> is quite unusual. Are you sure this is correct ?
>
> Guenter

I should call device_remove_file here. Terribly sorry for the
carelessness.

Best Regards
Junjie Mao
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