+static int is_good_ss_cap(struct usbtest_dev *tdev, u8 *buf)
+{
+ struct usb_ss_cap_descriptor *ss;
+
+ ss = (struct usb_ss_cap_descriptor *) buf;
+
+ if (ss->bLength != USB_DT_USB_SS_CAP_SIZE) {
+ ERROR(tdev, "bogus superspeed device capability descriptor length\n");
+ return 0;
+ }
+
+ /*
+ * only bit[1] of bmAttributes is used for LTM and others are
+ * reserved
+ */
+ if (ss->bmAttributes & ~0x02) { /* reserved == 0 */
+ ERROR(tdev, "reserved bits set in bmAttributes\n");
+ return 0;
+ }
+
+ /* bits[0:3] of wSpeedSupported is used and others are reserved */
+ if (le16_to_cpu(ss->wSpeedSupported) & ~0x0f) { /* reserved == 0 */
+ ERROR(tdev, "reserved bits set in wSpeedSupported\n");
+ return 0;
+ }
+
+ return 1;
+}
+