linux-kernel - [PATCH 3/3] USB : serial : pl2303 wake up after dcd status check.

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Date:	Fri, 13 Sep 2013 17:35:13 +0200
From:	Paul Chavent <Paul.Chavent@...ra.fr>
To:	linux-usb@...r.kernel.org, gregkh@...uxfoundation.org,
	jhovold@...il.com, fschaefer.oss@...glemail.com, jslaby@...e.cz,
	max@...e.de, giometti@...eenne.com
Cc:	linux-kernel@...r.kernel.org, Paul Chavent <Paul.Chavent@...ra.fr>
Subject: [PATCH 3/3] USB : serial : pl2303 wake up after dcd status check.

Seems to be done this way in other drivers (ch341, 8250, ...).
And get tty reference only if dcd_change need to be called.

Signed-off-by: Paul Chavent <paul.chavent@...ra.fr>
---
 drivers/usb/serial/pl2303.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index e7a84f0..8b81188 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -854,15 +854,16 @@ static void pl2303_update_line_status(struct usb_serial_port *port,
 	spin_unlock_irqrestore(&priv->lock, flags);
 	if (priv->line_status & UART_BREAK_ERROR)
 		usb_serial_handle_break(port);
-	wake_up_interruptible(&port->port.delta_msr_wait);
 
-	tty = tty_port_tty_get(&port->port);
-	if (!tty)
-		return;
-	if ((priv->line_status ^ prev_line_status) & UART_DCD)
-		usb_serial_handle_dcd_change(port, tty,
-				priv->line_status & UART_DCD);
-	tty_kref_put(tty);
+	if ((priv->line_status ^ prev_line_status) & UART_DCD) {
+		tty = tty_port_tty_get(&port->port);
+		if (tty)
+			usb_serial_handle_dcd_change(port, tty,
+					priv->line_status & UART_DCD);
+		tty_kref_put(tty);
+	}
+
+	wake_up_interruptible(&port->port.delta_msr_wait);
 }
 
 static void pl2303_read_int_callback(struct urb *urb)
-- 
1.7.12.1

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