Bugfix: icarus: Check for valid fd before all usage

Conflicts:
	driver-icarus.c

driver-icarus.c

@@ -287,6 +287,9 @@ static int icarus_write(int fd, const void *buf, size_t bufLen)
 {
 	size_t ret;
 
+	if (unlikely(fd == -1))
+		return 1;
+	
 	ret = write(fd, buf, bufLen);
 	if (unlikely(ret != bufLen))
 		return 1;
@@ -299,7 +302,10 @@ static int icarus_write(int fd, const void *buf, size_t bufLen)
 static void do_icarus_close(struct thr_info *thr)
 {
 	struct cgpu_info *icarus = thr->cgpu;
-	icarus_close(icarus->device_fd);
+	const int fd = icarus->device_fd;
+	if (fd == -1)
+		return;
+	icarus_close(fd);
 	icarus->device_fd = -1;
 }
 
@@ -709,7 +715,7 @@ static bool icarus_reopen(struct cgpu_info *icarus, struct icarus_state *state,
 	struct ICARUS_INFO *info = icarus->cgpu_data;
 
 	// Reopen the serial port to workaround a USB-host-chipset-specific issue with the Icarus's buggy USB-UART
-	icarus_close(icarus->device_fd);
+	do_icarus_close(icarus->thr[0]);
 	*fdp = icarus->device_fd = icarus_open(icarus->device_path, info->baud);
 	if (unlikely(-1 == *fdp)) {
 		applog(LOG_ERR, "%s %u: Failed to reopen on %s", icarus->api->name, icarus->device_id, icarus->device_path);
@@ -799,6 +805,9 @@ static int64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 	fd = icarus->device_fd;
 	info = icarus->cgpu_data;
 
+	if (unlikely(fd == -1) && !icarus_reopen(icarus, state, &fd))
+		return -1;
+	
 	if (!state->firstrun) {
 		if (state->changework)
 		{