From 95bef012ea4a3cce437a4fcf59bb097d14944b0d Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oliver@neukum.org>
Date: Tue, 22 Jan 2008 13:56:18 +0100
Subject: USB: more serial drivers writing after disconnect

this covers the rest of the obvious cases by using the flags
and locks to guard against disconnect which were introduced
in the earlier patch against mos7720.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/airprime.c b/drivers/usb/serial/airprime.c
index 77bb893..f156dba 100644
--- a/drivers/usb/serial/airprime.c
+++ b/drivers/usb/serial/airprime.c
@@ -217,7 +217,10 @@ static void airprime_close(struct usb_serial_port *port, struct file * filp)
 	priv->rts_state = 0;
 	priv->dtr_state = 0;
 
-	airprime_send_setup(port);
+	mutex_lock(&port->serial->disc_mutex);
+	if (!port->serial->disconnected)
+		airprime_send_setup(port);
+	mutex_lock(&port->serial->disc_mutex);
 
 	for (i = 0; i < NUM_READ_URBS; ++i) {
 		usb_kill_urb (priv->read_urbp[i]);
diff --git a/drivers/usb/serial/cp2101.c b/drivers/usb/serial/cp2101.c
index cd5f71b..f3ca660 100644
--- a/drivers/usb/serial/cp2101.c
+++ b/drivers/usb/serial/cp2101.c
@@ -348,7 +348,10 @@ static void cp2101_close (struct usb_serial_port *port, struct file * filp)
 	usb_kill_urb(port->write_urb);
 	usb_kill_urb(port->read_urb);
 
-	cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
+	mutex_lock(&port->serial->disc_mutex);
+	if (!port->serial->disconnected)
+		cp2101_set_config_single(port, CP2101_UART, UART_DISABLE);
+	mutex_unlock(&port->serial->disc_mutex);
 }
 
 /*
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 2c142bb..90dcc62 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1198,7 +1198,8 @@ static void ftdi_close (struct usb_serial_port *port, struct file *filp)
 
 	dbg("%s", __FUNCTION__);
 
-	if (c_cflag & HUPCL){
+	mutex_lock(&port->serial->disc_mutex);
+	if (c_cflag & HUPCL && !port->serial->disconnected){
 		/* Disable flow control */
 		if (usb_control_msg(port->serial->dev,
 				    usb_sndctrlpipe(port->serial->dev, 0),
@@ -1212,6 +1213,7 @@ static void ftdi_close (struct usb_serial_port *port, struct file *filp)
 		/* drop RTS and DTR */
 		clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
 	} /* Note change no line if hupcl is off */
+	mutex_unlock(&port->serial->disc_mutex);
 
 	/* cancel any scheduled reading */
 	cancel_delayed_work(&priv->rx_work);
diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
index f1c90cf..d74e43d 100644
--- a/drivers/usb/serial/garmin_gps.c
+++ b/drivers/usb/serial/garmin_gps.c
@@ -1020,19 +1020,26 @@ static void garmin_close (struct usb_serial_port *port, struct file * filp)
 	if (!serial)
 		return;
 
-	garmin_clear(garmin_data_p);
+	mutex_lock(&port->serial->disc_mutex);
+	if (!port->serial->disconnected)
+		garmin_clear(garmin_data_p);
 
 	/* shutdown our urbs */
 	usb_kill_urb (port->read_urb);
 	usb_kill_urb (port->write_urb);
 
-	if (noResponseFromAppLayer(garmin_data_p) ||
-	    ((garmin_data_p->flags & CLEAR_HALT_REQUIRED) != 0)) {
-		process_resetdev_request(port);
-		garmin_data_p->state = STATE_RESET;
+	if (!port->serial->disconnected) {
+		if (noResponseFromAppLayer(garmin_data_p) ||
+		    ((garmin_data_p->flags & CLEAR_HALT_REQUIRED) != 0)) {
+			process_resetdev_request(port);
+			garmin_data_p->state = STATE_RESET;
+		} else {
+			garmin_data_p->state = STATE_DISCONNECTED;
+		}
 	} else {
 		garmin_data_p->state = STATE_DISCONNECTED;
 	}
+	mutex_unlock(&port->serial->disc_mutex);
 }
 
 
diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index c234799..22b3f78 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -362,7 +362,7 @@ static void visor_close (struct usb_serial_port *port, struct file * filp)
 			kfree (transfer_buffer);
 		}
 	}
-	mutex_lock(&port->serial->disc_mutex);
+	mutex_unlock(&port->serial->disc_mutex);
 
 	if (stats)
 		dev_info(&port->dev, "Bytes In = %d  Bytes Out = %d\n",
-- 
cgit v0.10.2