TTY: add tty_port_tty_wakeup helper

It allows for cleaning up on a considerable amount of places. They did
port_get, wakeup, kref_put. Now the only thing needed is to call
tty_port_tty_wakeup which does exactly that.

One exception is ifx6x60 where tty_wakeup was open-coded. We now call
tty_wakeup properly there.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

8 files changed, 18 insertions, 72 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 8ac25adf31b4..755766e4b756 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -475,15 +475,10 @@ static void acm_write_bulk(struct urb *urb)
 static void acm_softint(struct work_struct *work)
 {
 	struct acm *acm = container_of(work, struct acm, work);
-	struct tty_struct *tty;
 
 	dev_vdbg(&acm->data->dev, "%s\n", __func__);
 
-	tty = tty_port_tty_get(&acm->port);
-	if (!tty)
-		return;
-	tty_wakeup(tty);
-	tty_kref_put(tty);
+	tty_port_tty_wakeup(&acm->port);
 }
 
 /*
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index ebe45fa0ed50..31191581060c 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -210,7 +210,6 @@ struct digi_port {
 
 /* Local Function Declarations */
 
-static void digi_wakeup_write(struct usb_serial_port *port);
 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);
@@ -374,20 +373,10 @@ static void digi_wakeup_write_lock(struct work_struct *work)
 	unsigned long flags;
 
 	spin_lock_irqsave(&priv->dp_port_lock, flags);
-	digi_wakeup_write(port);
+	tty_port_tty_wakeup(&port->port);
 	spin_unlock_irqrestore(&priv->dp_port_lock, flags);
 }
 
-static void digi_wakeup_write(struct usb_serial_port *port)
-{
-	struct tty_struct *tty = tty_port_tty_get(&port->port);
-	if (tty) {
-		tty_wakeup(tty);
-		tty_kref_put(tty);
-	}
-}
-
-
 /*
  *  Digi Write OOB Command
  *
@@ -1044,7 +1033,7 @@ static void digi_write_bulk_callback(struct urb *urb)
 		}
 	}
 	/* wake up processes sleeping on writes immediately */
-	digi_wakeup_write(port);
+	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);
@@ -1522,7 +1511,7 @@ static int digi_read_oob_callback(struct urb *urb)
 				/* port must be open to use tty struct */
 				if (rts) {
 					tty->hw_stopped = 0;
-					digi_wakeup_write(port);
+					tty_port_tty_wakeup(&port->port);
 				}
 			} else {
 				priv->dp_modem_signals &= ~TIOCM_CTS;
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index b00e5cbf741f..44e5208f7c61 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -565,7 +565,6 @@ static void edge_interrupt_callback(struct urb *urb)
 	struct device *dev;
 	struct edgeport_port *edge_port;
 	struct usb_serial_port *port;
-	struct tty_struct *tty;
 	unsigned char *data = urb->transfer_buffer;
 	int length = urb->actual_length;
 	int bytes_avail;
@@ -644,12 +643,7 @@ static void edge_interrupt_callback(struct urb *urb)
 
 					/* tell the tty driver that something
 					   has changed */
-					tty = tty_port_tty_get(
-						&edge_port->port->port);
-					if (tty) {
-						tty_wakeup(tty);
-						tty_kref_put(tty);
-					}
+					tty_port_tty_wakeup(&edge_port->port->port);
 					/* Since we have more credit, check
 					   if more data can be sent */
 					send_more_port_data(edge_serial,
@@ -738,7 +732,6 @@ static void edge_bulk_in_callback(struct urb *urb)
 static void edge_bulk_out_data_callback(struct urb *urb)
 {
 	struct edgeport_port *edge_port = urb->context;
-	struct tty_struct *tty;
 	int status = urb->status;
 
 	if (status) {
@@ -747,14 +740,8 @@ static void edge_bulk_out_data_callback(struct urb *urb)
 			__func__, status);
 	}
 
-	tty = tty_port_tty_get(&edge_port->port->port);
-
-	if (tty && edge_port->open) {
-		/* let the tty driver wakeup if it has a special
-		   write_wakeup function */
-		tty_wakeup(tty);
-	}
-	tty_kref_put(tty);
+	if (edge_port->open)
+		tty_port_tty_wakeup(&edge_port->port->port);
 
 	/* Release the Write URB */
 	edge_port->write_in_progress = false;
@@ -773,7 +760,6 @@ static void edge_bulk_out_data_callback(struct urb *urb)
 static void edge_bulk_out_cmd_callback(struct urb *urb)
 {
 	struct edgeport_port *edge_port = urb->context;
-	struct tty_struct *tty;
 	int status = urb->status;
 
 	atomic_dec(&CmdUrbs);
@@ -794,13 +780,9 @@ static void edge_bulk_out_cmd_callback(struct urb *urb)
 		return;
 	}
 
-	/* Get pointer to tty */
-	tty = tty_port_tty_get(&edge_port->port->port);
-
 	/* tell the tty driver that something has changed */
-	if (tty && edge_port->open)
-		tty_wakeup(tty);
-	tty_kref_put(tty);
+	if (edge_port->open)
+		tty_port_tty_wakeup(&edge_port->port->port);
 
 	/* we have completed the command */
 	edge_port->commandPending = false;
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index 3b17d5d13dc8..2230223978ca 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -104,10 +104,8 @@ static void keyspan_pda_wakeup_write(struct work_struct *work)
 	struct keyspan_pda_private *priv =
 		container_of(work, struct keyspan_pda_private, wakeup_work);
 	struct usb_serial_port *port = priv->port;
-	struct tty_struct *tty = tty_port_tty_get(&port->port);
-	if (tty)
-		tty_wakeup(tty);
-	tty_kref_put(tty);
+
+	tty_port_tty_wakeup(&port->port);
 }
 
 static void keyspan_pda_request_unthrottle(struct work_struct *work)
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index e0ebec3b5d6a..e956eae198fd 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -932,7 +932,6 @@ static void mos7720_bulk_in_callback(struct urb *urb)
 static void mos7720_bulk_out_data_callback(struct urb *urb)
 {
 	struct moschip_port *mos7720_port;
-	struct tty_struct *tty;
 	int status = urb->status;
 
 	if (status) {
@@ -946,11 +945,8 @@ static void mos7720_bulk_out_data_callback(struct urb *urb)
 		return ;
 	}
 
-	tty = tty_port_tty_get(&mos7720_port->port->port);
-
-	if (tty && mos7720_port->open)
-		tty_wakeup(tty);
-	tty_kref_put(tty);
+	if (mos7720_port->open)
+		tty_port_tty_wakeup(&mos7720_port->port->port);
 }
 
 /*
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 809fb329eca5..08284d28e84b 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -814,7 +814,6 @@ static void mos7840_bulk_out_data_callback(struct urb *urb)
 {
 	struct moschip_port *mos7840_port;
 	struct usb_serial_port *port;
-	struct tty_struct *tty;
 	int status = urb->status;
 	int i;
 
@@ -837,10 +836,8 @@ static void mos7840_bulk_out_data_callback(struct urb *urb)
 	if (mos7840_port_paranoia_check(port, __func__))
 		return;
 
-	tty = tty_port_tty_get(&port->port);
-	if (tty && mos7840_port->open)
-		tty_wakeup(tty);
-	tty_kref_put(tty);
+	if (mos7840_port->open)
+		tty_port_tty_wakeup(&port->port);
 
 }
 
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 39cb9b807c3c..437f2d579cde 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -1227,7 +1227,6 @@ static void ti_send(struct ti_port *tport)
 {
 	int count, result;
 	struct usb_serial_port *port = tport->tp_port;
-	struct tty_struct *tty = tty_port_tty_get(&port->port);	/* FIXME */
 	unsigned long flags;
 
 	spin_lock_irqsave(&tport->tp_lock, flags);
@@ -1268,14 +1267,12 @@ static void ti_send(struct ti_port *tport)
 	}
 
 	/* more room in the buffer for new writes, wakeup */
-	if (tty)
-		tty_wakeup(tty);
-	tty_kref_put(tty);
+	tty_port_tty_wakeup(&port->port);
+
 	wake_up_interruptible(&tport->tp_write_wait);
 	return;
 unlock:
 	spin_unlock_irqrestore(&tport->tp_lock, flags);
-	tty_kref_put(tty);
 	return;
 }
 
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index a19ed74d770d..2df84845bafb 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -541,16 +541,8 @@ static void usb_serial_port_work(struct work_struct *work)
 {
 	struct usb_serial_port *port =
 		container_of(work, struct usb_serial_port, work);
-	struct tty_struct *tty;
 
-	tty = tty_port_tty_get(&port->port);
-	if (!tty)
-		return;
-
-	dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
-
-	tty_wakeup(tty);
-	tty_kref_put(tty);
+	tty_port_tty_wakeup(&port->port);
 }
 
 static void kill_traffic(struct usb_serial_port *port)