/* return RES_COUNTER_MAX(unlimited) if "-1" is specified */
if (*buf == '-') {
- res = simple_strtoull(buf + 1, &end, 10);
- if (res != 1 || *end != '\0')
+ int rc = kstrtoull(buf + 1, 10, &res);
+
+ if (rc)
+ return rc;
+ if (res != 1)
return -EINVAL;
*resp = RES_COUNTER_MAX;
return 0;