Re: [RFC PATCH 02/06] input/rmi4: Core files

[devendra.aaru]

On Sat, Oct 6, 2012 at 8:19 AM, Joe Perches <joe@xxxxxxxxxxx> wrote:
> On Fri, 2012-10-05 at 21:09 -0700, Christopher Heiny wrote:
> []
>
> Just some trivial comments:
>
>> diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
> []
>> @@ -0,0 +1,1529 @@
> []
>> +static ssize_t delay_write(struct file *filp, const char __user *buffer,
>> +                        size_t size, loff_t *offset) {
>> +     struct driver_debugfs_data *data = filp->private_data;
>> +     struct rmi_device_platform_data *pdata =
>> +                     data->rmi_dev->phys->dev->platform_data;
>> +     int retval;
>> +     char local_buf[size];
>> +     unsigned int new_read_delay;
>> +     unsigned int new_write_delay;
>> +     unsigned int new_block_delay;
>> +     unsigned int new_pre_delay;
>> +     unsigned int new_post_delay;
>> +
>> +     retval = copy_from_user(local_buf, buffer, size);
>> +     if (retval)
>> +             return -EFAULT;
>> +
>> +     retval = sscanf(local_buf, "%u %u %u %u %u", &new_read_delay,
>> +                     &new_write_delay, &new_block_delay,
>> +                     &new_pre_delay, &new_post_delay);
>> +     if (retval != 5) {
>> +             dev_err(&data->rmi_dev->dev,
>> +                     "Incorrect number of values provided for delay.");
>> +             return -EINVAL;
>> +     }
>> +     if (new_read_delay < 0) {
>
> These are unnecessary tests as unsigned values are never < 0.
>

Nope.

1 main()
  2 {
  3         char buf[100] = "1 -2";
  4         int t, t2;
  5
  6         sscanf(buf, "%u %u", &t, &t2);
  7
  8         if (t > 0) {
  9                 printf("greater\n");
 10         }
 11
 12         if (t2 > 0) {
 13                 printf("greater\n");
 14         } else {
 15                 printf("lesser\n");
 16         }
 17 }


Thanks,
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