FAILED: patch "[PATCH] USB: serial: digi_acceleport: fix write-wakeup deadlocks" failed to apply to 4.9-stable tree

index 016e7dec3196..968e08cdcb09 100644
@@ -19,7 +19,6 @@
 #include <linux/tty_flip.h>
 #include <linux/module.h>
 #include <linux/spinlock.h>
-#include <linux/workqueue.h>
 #include <linux/uaccess.h>
 #include <linux/usb.h>
 #include <linux/wait.h>

@@ -198,14 +197,12 @@ struct digi_port {
 	int dp_throttle_restart;
 	wait_queue_head_t dp_flush_wait;
 	wait_queue_head_t dp_close_wait;	/* wait queue for close */
-	struct work_struct dp_wakeup_work;
 	struct usb_serial_port *dp_port;
 };
 
 
 /* Local Function Declarations */
 
-static void digi_wakeup_write_lock(struct work_struct *work);
 static int digi_write_oob_command(struct usb_serial_port *port,
 	unsigned char *buf, int count, int interruptible);
 static int digi_write_inb_command(struct usb_serial_port *port,

@@ -356,26 +353,6 @@ __releases(lock)
 	return timeout;
 }
 
-
-/*
- *  Digi Wakeup Write
- *
- *  Wake up port, line discipline, and tty processes sleeping
- *  on writes.
- */
-
-static void digi_wakeup_write_lock(struct work_struct *work)
-{
-	struct digi_port *priv =
-			container_of(work, struct digi_port, dp_wakeup_work);
-	struct usb_serial_port *port = priv->dp_port;
-	unsigned long flags;
-
-	spin_lock_irqsave(&priv->dp_port_lock, flags);
-	tty_port_tty_wakeup(&port->port);
-	spin_unlock_irqrestore(&priv->dp_port_lock, flags);
-}
-
 /*
  *  Digi Write OOB Command
  *

@@ -985,6 +962,7 @@ static void digi_write_bulk_callback(struct urb *urb)
 	unsigned long flags;
 	int ret = 0;
 	int status = urb->status;
+	bool wakeup;
 
 	/* port and serial sanity check */
 	if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) {

@@ -1011,6 +989,7 @@ static void digi_write_bulk_callback(struct urb *urb)
 	}
 
 	/* try to send any buffered data on this port */
+	wakeup = true;
 	spin_lock_irqsave(&priv->dp_port_lock, flags);
 	priv->dp_write_urb_in_use = 0;
 	if (priv->dp_out_buf_len > 0) {

@@ -1026,19 +1005,18 @@ static void digi_write_bulk_callback(struct urb *urb)
 		if (ret == 0) {
 			priv->dp_write_urb_in_use = 1;
 			priv->dp_out_buf_len = 0;
+			wakeup = false;
 		}
 	}
-	/* wake up processes sleeping on writes immediately */
-	tty_port_tty_wakeup(&port->port);
-	/* also queue up a wakeup at scheduler time, in case we */
-	/* lost the race in write_chan(). */
-	schedule_work(&priv->dp_wakeup_work);
-
 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);
+
 	if (ret && ret != -EPERM)
 		dev_err_console(port,
 			"%s: usb_submit_urb failed, ret=%d, port=%d\n",
 			__func__, ret, priv->dp_port_num);
+
+	if (wakeup)
+		tty_port_tty_wakeup(&port->port);
 }
 
 static int digi_write_room(struct tty_struct *tty)

@@ -1238,7 +1216,6 @@ static int digi_port_init(struct usb_serial_port *port, unsigned port_num)
 	init_waitqueue_head(&priv->dp_transmit_idle_wait);
 	init_waitqueue_head(&priv->dp_flush_wait);
 	init_waitqueue_head(&priv->dp_close_wait);
-	INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock);
 	priv->dp_port = port;
 
 	init_waitqueue_head(&port->write_wait);

@@ -1507,13 +1484,14 @@ static int digi_read_oob_callback(struct urb *urb)
 			rts = C_CRTSCTS(tty);
 
 		if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) {
+			bool wakeup = false;
+
 			spin_lock_irqsave(&priv->dp_port_lock, flags);
 			/* convert from digi flags to termiox flags */
 			if (val & DIGI_READ_INPUT_SIGNALS_CTS) {
 				priv->dp_modem_signals |= TIOCM_CTS;
-				/* port must be open to use tty struct */
 				if (rts)
-					tty_port_tty_wakeup(&port->port);
+					wakeup = true;
 			} else {
 				priv->dp_modem_signals &= ~TIOCM_CTS;
 				/* port must be open to use tty struct */

@@ -1532,6 +1510,9 @@ static int digi_read_oob_callback(struct urb *urb)
 				priv->dp_modem_signals &= ~TIOCM_CD;
 
 			spin_unlock_irqrestore(&priv->dp_port_lock, flags);
+
+			if (wakeup)
+				tty_port_tty_wakeup(&port->port);
 		} else if (opcode == DIGI_CMD_TRANSMIT_IDLE) {
 			spin_lock_irqsave(&priv->dp_port_lock, flags);
 			priv->dp_transmit_idle = 1;