static int simple_check_buf(struct usbtest_dev *tdev, struct urb *urb)
{
unsigned i;
u8 expected;
u8 *buf = urb->transfer_buffer;
unsigned len = urb->actual_length;
int ret = check_guard_bytes(tdev, urb);
if (ret)
return ret;
for (i = 0; i < len; i++, buf++) {
switch (pattern) {
case 0:
expected = 0;
break;
case 1:
expected = i % 63;
break;
default:
expected = !*buf;
break;
}
if (*buf == expected)
continue;
ERROR(tdev, "buf[%d] = %d (not %d)\n", i, *buf, expected);
return -EINVAL;
}
return 0;
}
static int simple_check_buf(struct usbtest_dev *tdev, struct urb *urb)
{
unsigned i;
u8 expected;
u8 *buf = urb->transfer_buffer;
unsigned len = urb->actual_length;
int ret = check_guard_bytes(tdev, urb);
if (ret)
return ret;
for (i = 0; i < len; i++, buf++) {
switch (pattern) {
/* all-zeroes has no synchronization issues */
case 0:
expected = 0;
break;
/* mod63 stays in sync with short-terminated transfers,
* or otherwise when host and gadget agree on how large
* each usb transfer request should be. resync is done
* with set_interface or set_config.
*/
case 1: /* mod63 */
expected = i % 63;
break;
/* always fail unsupported patterns */
default:
expected = !*buf;
break;
}
if (*buf == expected)
continue;
ERROR(tdev, "buf[%d] = %d (not %d)\n", i, *buf, expected);
return -EINVAL;
}
return 0;
}
