problem in sysfs store function count value and buf not appropriate

[kanishk rastogi <kanishk_rastogi85@xxxxxxxxx>]

hi all,

i have created a device file with only write
permission::

ssize_t add_target_store(struct device *dev, const
char *buf, size_t count)
{
 int data;
 struct vt_host_info * vthost;
 vthost=to_vt_host_info(dev);
 
 if(1!=sscanf(buf,"%d",&data))-->it goes inside
 {
   printk(KERN_ERR "Invalid Data Entered count ::%u::
%s",(unsigned int)count,buf);
   return -EINVAL;
 }
 
 printk("Device target will be  added\n");
 return count;
}

DEVICE_ATTR(add_target, S_IWUSR , NULL,
add_target_store);

and created the file using ::
if((i=device_register(dev)))
        return i;
 device_create_file(dev ,&dev_attr_add_target);
but when i perform
echo 2 >sysfs file
it gives garbage
why is it so ??
thanks in advance

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