netdev - Re: [PATCH v2 02/27] HFI: Add HFI adapter control structure

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Date:	Thu, 21 Apr 2011 17:38:39 -0400
From:	Jim Dykman <dykmanj@...ux.vnet.ibm.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	netdev@...r.kernel.org,
	Piyush Chaudhary <piyushc@...ux.vnet.ibm.com>,
	Fu-Chung Chang <fcchang@...ux.vnet.ibm.com>,
	"William S. Cadden" <wscadden@...ux.vnet.ibm.com>,
	"Wen C. Chen" <winstonc@...ux.vnet.ibm.com>,
	Scot Sakolish <sakolish@...ux.vnet.ibm.com>,
	Jian Xiao <jian@...ux.vnet.ibm.com>,
	"Carol L. Soto" <clsoto@...ux.vnet.ibm.com>,
	"Sarah J. Sheppard" <sjsheppa@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 02/27] HFI: Add HFI adapter control structure

On 4/18/2011 8:19 AM, Ben Hutchings wrote:
> On Sun, 2011-04-17 at 23:21 -0400, dykmanj@...ux.vnet.ibm.com wrote:
>> From: Jim Dykman <dykmanj@...ux.vnet.ibm.com>
>>
>> Alloc/free of hfidd_acs to track the state of each HFI
> [...]
>> --- /dev/null
>> +++ b/drivers/net/hfi/core/hfidd_adpt.c
> [...]
>> +int hfidd_alloc_adapter(struct hfidd_acs **adpt, dev_t devno, void *uiop)
>> +{
>> +
>> +	struct hfidd_acs	*p_acs = NULL;
>> +
>> +	p_acs = kzalloc(sizeof(*p_acs), GFP_KERNEL);
>> +	if (p_acs == NULL)
>> +		return -ENOMEM;
>> +
>> +	p_acs->dev_num = devno;
>> +	p_acs->index  = MINOR(devno);
>> +	p_acs->state  = HFI_INVALID;
>> +	snprintf(p_acs->name, HFI_DEVICE_NAME_MAX - 1,
>> +			"%s%d", HFIDD_DEV_NAME, p_acs->index);
> 
> snprintf() always null-terminates so the buffer length should be
> specified as HFI_DEVICE_NAME_MAX or sizeof(p_acs->name).
> 

Ok.

> [...]
>> --- a/drivers/net/hfi/core/hfidd_init.c
>> +++ b/drivers/net/hfi/core/hfidd_init.c
> [...]
>>  static int __init hfidd_mod_init(void)
>>  {
>>  	int			rc = 0;
>>  
>> +	hfidd_global.acs_cnt = 0;
>> +
>>  	rc = hfidd_create_class();
>>  	if (rc < 0) {
>>  		printk(KERN_ERR "%s: hfidd_mod_init: hfidd_create_class failed"
>> @@ -129,12 +172,26 @@ static int __init hfidd_mod_init(void)
>>  		return -1;
>>  	}
>>  
>> +	rc = hfidd_create_devices();
>> +	if (rc < 0) {
>> +		printk(KERN_ERR "%s: hfidd_mod_init: hfidd_create_devices"
>> +			" failed rc = %d\n", HFIDD_DEV_NAME, rc);
>> +		goto error1;
>> +	}
>> +
>>  	printk(KERN_INFO "IBM hfi device driver loaded sucessfully\n");
>>  	return 0;
>> +
>> +error1:
>> +	hfidd_destroy_class();
>> +
>> +	/* Returning -1 so insmod will fail */
>> +	return -1;
>>  }
> [...]
> 
> Should be 'return rc'.  Never return -1 as a generic failure; it means
> -EPERM.
> 

Ok

> Ben.
> 

Jim

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