Use cancellable transfers on bitfury device.

driver-bitfury.c

@@ -248,7 +248,7 @@ static int64_t bitfury_scanwork(struct thr_info *thr)
 	cgtime(&tv_now);
 	ms_diff = 600 - ms_tdiff(&tv_now, &info->tv_start);
 	if (ms_diff > 0) {
-		usb_read_timeout(bitfury, info->buf, 512, &amount, ms_diff, C_BF1_GETRES);
+		usb_read_timeout_cancellable(bitfury, info->buf, 512, &amount, ms_diff, C_BF1_GETRES);
 		info->tot += amount;
 	}
 
@@ -261,8 +261,8 @@ static int64_t bitfury_scanwork(struct thr_info *thr)
 	ms_diff = BF1WAIT - ms_tdiff(&tv_now, &info->tv_start);
 	if (unlikely(ms_diff < 10))
 		ms_diff = 10;
-	usb_read_once_timeout(bitfury, info->buf + info->tot, BF1MSGSIZE,
-			      &amount, ms_diff, C_BF1_GETRES);
+	usb_read_once_timeout_cancellable(bitfury, info->buf + info->tot, BF1MSGSIZE,
+					  &amount, ms_diff, C_BF1_GETRES);
 	info->tot += amount;
 	while (amount) {
 		usb_read_once_timeout(bitfury, info->buf + info->tot, 512, &amount, 10, C_BF1_GETRES);