netdev - Re: [RFC PATCH 1/5] libfcoe, fcoe: Allow user to set a ctlr's mode

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Date:	Wed, 12 Sep 2012 19:24:37 +0000
From:	"Love, Robert W" <robert.w.love@...el.com>
To:	Bart Van Assche <bvanassche@....org>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"bprakash@...adcom.com" <bprakash@...adcom.com>,
	"devel@...n-fcoe.org" <devel@...n-fcoe.org>
Subject: Re: [RFC PATCH 1/5] libfcoe, fcoe: Allow user to set a ctlr's mode

On Mon 10 Sep 2012 10:51:41 PM PDT, Bart Van Assche wrote:
> On 09/11/12 00:59, Robert Love wrote:
>> +static enum fip_conn_type fcoe_parse_mode(const char *buf,
>> +				  const struct fcoe_ctlr_mode_table *tbl)
>> +{
>> +	int modeint = -1, i, rv;
>> +	char *p, modestr[FCOE_MAX_MODENAME_LEN + 1] = { 0, };
>> +
>> +	for (p = (char *)buf; *p; p++)
>> +		if (!(isdigit(*p) || isspace(*p)))
>> +			break;
>
> If you change the declaration of p from "char *p" into "const char *p"
> you won't need a cast in the above for loop.
>
> [ ... ]
>
>> -static FCOE_DEVICE_ATTR(ctlr, mode, S_IRUGO,
>> -			show_ctlr_mode, NULL);
>> +
>> +static ssize_t store_ctlr_mode(struct device *dev,
>> +			       struct device_attribute *attr,
>> +			       const char *buf, size_t count)
>> +{
>> +	struct fcoe_ctlr_device *ctlr = dev_to_ctlr(dev);
>> +
>> +	if (!ctlr->f->set_fcoe_ctlr_mode)
>> +		return -EINVAL;
>> +
>> +	ctlr->mode = fcoe_parse_mode(buf, ctlr_mode_tbl);
>
> As far as I know sysfs doesn't terminate buf with a '\0' before calling
> a store method. Does that mean that you are passing a string that is not
> '\0'-terminated to a function that expects a '\0'-terminated string ?
>
> Bart.

Hey Bart. I just wanted to acknowledge your comments. I will make sure 
that they're addressed after figuring out if sysfs is the right place 
for the interfaces.

Thanks, //Rob