Emulate the libusb_control_transfer sync setup in our async variant.

usbutils.c

@@ -2710,29 +2710,26 @@ out_noerrmsg:
  */
 static int usb_control_transfer(libusb_device_handle *dev_handle, uint8_t bmRequestType,
 				uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
-				unsigned char *buffer, uint16_t wLength, unsigned int timeout,
-				bool receive)
+				unsigned char *buffer, uint16_t wLength, unsigned int timeout)
 {
 	struct usb_transfer ut;
 	unsigned char buf[70];
 	int err, transferred;
 
 	init_usb_transfer(&ut);
-	if (!receive)
-		memcpy(buf + LIBUSB_CONTROL_SETUP_SIZE, buffer, wLength);
 	libusb_fill_control_setup(buf, bmRequestType, bRequest, wValue,
 				  wIndex, wLength);
+	if ((bmRequestType & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_OUT)
+		memcpy(buf + LIBUSB_CONTROL_SETUP_SIZE, buffer, wLength);
 	libusb_fill_control_transfer(ut.transfer, dev_handle, buf, transfer_callback,
 				     &ut, 0);
 	err = libusb_submit_transfer(ut.transfer);
 	if (!err)
 		err = callback_wait(&ut, &transferred, timeout);
-	if (!err && transferred) {
-		if (receive) {
-			unsigned char *ofbuf = libusb_control_transfer_get_data(ut.transfer);
-
-			memcpy(buffer, ofbuf, transferred);
-		}
+	if (err == LIBUSB_TRANSFER_COMPLETED && transferred) {
+		if ((bmRequestType & LIBUSB_ENDPOINT_DIR_MASK) == LIBUSB_ENDPOINT_IN)
+			memcpy(buffer, libusb_control_transfer_get_data(ut.transfer),
+			       transferred);
 		err = transferred;
 		goto out;
 	}
@@ -2800,7 +2797,7 @@ int __usb_transfer(struct cgpu_info *cgpu, uint8_t request_type, uint8_t bReques
 	STATS_TIMEVAL(&tv_start);
 	cg_rlock(&cgusb_fd_lock);
 	err = usb_control_transfer(usbdev->handle, request_type,
-		bRequest, wValue, wIndex, buf, (uint16_t)siz, timeout, false);
+		bRequest, wValue, wIndex, buf, (uint16_t)siz, timeout);
 	cg_runlock(&cgusb_fd_lock);
 	STATS_TIMEVAL(&tv_finish);
 	USB_STATS(cgpu, &tv_start, &tv_finish, err, MODE_CTRL_WRITE, cmd, SEQ0, timeout);
@@ -2883,7 +2880,7 @@ int _usb_transfer_read(struct cgpu_info *cgpu, uint8_t request_type, uint8_t bRe
 	cg_rlock(&cgusb_fd_lock);
 	err = usb_control_transfer(usbdev->handle, request_type,
 		bRequest, wValue, wIndex,
-		tbuf, (uint16_t)bufsiz, timeout, true);
+		tbuf, (uint16_t)bufsiz, timeout);
 	cg_runlock(&cgusb_fd_lock);
 	STATS_TIMEVAL(&tv_finish);
 	USB_STATS(cgpu, &tv_start, &tv_finish, err, MODE_CTRL_READ, cmd, SEQ0, timeout);