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authorJohan Hovold <jhovold@gmail.com>2012-10-25 10:29:10 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-25 09:36:58 -0700
commit2f0295adf6438188c4cd0868f2b1976a2b034e1d (patch)
treed9e1ee413e1bbaaf4b2e5e44d9b3fd79de3a4b86 /drivers/usb/serial/quatech2.c
parent8e512ab0b675da20e023439a5811e3f2554e6852 (diff)
USB: quatech2: fix io after disconnect
Make sure no control urb is submitted during close after a disconnect by checking the disconnected flag. Cc: <stable@vger.kernel.org> Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial/quatech2.c')
-rw-r--r--drivers/usb/serial/quatech2.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index 7e8d8f32b634..ffcfc962ab10 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -427,6 +427,12 @@ static void qt2_close(struct usb_serial_port *port)
port_priv->urb_in_use = false;
spin_unlock_irqrestore(&port_priv->urb_lock, flags);
+ mutex_lock(&port->serial->disc_mutex);
+ if (port->serial->disconnected) {
+ mutex_unlock(&port->serial->disc_mutex);
+ return;
+ }
+
/* flush the port transmit buffer */
i = usb_control_msg(serial->dev,
usb_rcvctrlpipe(serial->dev, 0),
@@ -458,6 +464,7 @@ static void qt2_close(struct usb_serial_port *port)
dev_err(&port->dev, "%s - close port failed %i\n",
__func__, i);
+ mutex_unlock(&port->serial->disc_mutex);
}
static void qt2_disconnect(struct usb_serial *serial)