--- zzzz-none-000/linux-3.10.107/drivers/tty/synclink_gt.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/tty/synclink_gt.c	2021-02-04 17:41:59.000000000 +0000
@@ -672,15 +672,6 @@
 
 	DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
 
-	/* If port is closing, signal caller to try again */
-	if (tty_hung_up_p(filp) || info->port.flags & ASYNC_CLOSING){
-		if (info->port.flags & ASYNC_CLOSING)
-			interruptible_sleep_on(&info->port.close_wait);
-		retval = ((info->port.flags & ASYNC_HUP_NOTIFY) ?
-			-EAGAIN : -ERESTARTSYS);
-		goto cleanup;
-	}
-
 	mutex_lock(&info->port.mutex);
 	info->port.low_latency = (info->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 
@@ -1539,7 +1530,8 @@
 	DBGINFO(("%s hdlcdev_open\n", dev->name));
 
 	/* generic HDLC layer open processing */
-	if ((rc = hdlc_open(dev)))
+	rc = hdlc_open(dev);
+	if (rc)
 		return rc;
 
 	/* arbitrate between network and tty opens */
@@ -1803,7 +1795,8 @@
 
 	/* allocate and initialize network and HDLC layer objects */
 
-	if (!(dev = alloc_hdlcdev(info))) {
+	dev = alloc_hdlcdev(info);
+	if (!dev) {
 		printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
 		return -ENOMEM;
 	}
@@ -1824,7 +1817,8 @@
 	hdlc->xmit   = hdlcdev_xmit;
 
 	/* register objects with HDLC layer */
-	if ((rc = register_hdlc_device(dev))) {
+	rc = register_hdlc_device(dev);
+	if (rc) {
 		printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
 		free_netdev(dev);
 		return rc;
@@ -1879,7 +1873,8 @@
 
 			stat = 0;
 
-			if ((status = *(p+1) & (BIT1 + BIT0))) {
+			status = *(p + 1) & (BIT1 + BIT0);
+			if (status) {
 				if (status & BIT1)
 					icount->parity++;
 				else if (status & BIT0)
@@ -3273,7 +3268,6 @@
 	DECLARE_WAITQUEUE(wait, current);
 	int		retval;
 	bool		do_clocal = false;
-	bool		extra_count = false;
 	unsigned long	flags;
 	int		cd;
 	struct tty_port *port = &info->port;
@@ -3300,10 +3294,7 @@
 	add_wait_queue(&port->open_wait, &wait);
 
 	spin_lock_irqsave(&info->lock, flags);
-	if (!tty_hung_up_p(filp)) {
-		extra_count = true;
-		port->count--;
-	}
+	port->count--;
 	spin_unlock_irqrestore(&info->lock, flags);
 	port->blocked_open++;
 
@@ -3320,9 +3311,8 @@
 		}
 
 		cd = tty_port_carrier_raised(port);
-
- 		if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
- 			break;
+		if (do_clocal || cd)
+			break;
 
 		if (signal_pending(current)) {
 			retval = -ERESTARTSYS;
@@ -3338,7 +3328,7 @@
 	set_current_state(TASK_RUNNING);
 	remove_wait_queue(&port->open_wait, &wait);
 
-	if (extra_count)
+	if (!tty_hung_up_p(filp))
 		port->count++;
 	port->blocked_open--;
 
@@ -3387,12 +3377,11 @@
 	unsigned int pbufs;
 
 	/* allocate memory to hold descriptor lists */
-	info->bufs = pci_alloc_consistent(info->pdev, DESC_LIST_SIZE, &info->bufs_dma_addr);
+	info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
+					   &info->bufs_dma_addr);
 	if (info->bufs == NULL)
 		return -ENOMEM;
 
-	memset(info->bufs, 0, DESC_LIST_SIZE);
-
 	info->rbufs = (struct slgt_desc*)info->bufs;
 	info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
 
@@ -3760,7 +3749,8 @@
 	if (serial_driver) {
 		for (info=slgt_device_list ; info != NULL ; info=info->next_device)
 			tty_unregister_device(serial_driver, info->line);
-		if ((rc = tty_unregister_driver(serial_driver)))
+		rc = tty_unregister_driver(serial_driver);
+		if (rc)
 			DBGERR(("tty_unregister_driver error=%d\n", rc));
 		put_tty_driver(serial_driver);
 	}