@@ -434,6 +434,12 @@ 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),
@@ -465,6 +471,7 @@ 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)
This is a note to let you know that I have just added a patch titled USB: quatech2: fix io after disconnect to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.yuz tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Herton ------ From 404f6d62cb97649034c03cc8d634ed2fe2d9c5c7 Mon Sep 17 00:00:00 2001 From: Johan Hovold <jhovold@gmail.com> Date: Thu, 25 Oct 2012 10:29:10 +0200 Subject: [PATCH] USB: quatech2: fix io after disconnect commit 2f0295adf6438188c4cd0868f2b1976a2b034e1d upstream. Make sure no control urb is submitted during close after a disconnect by checking the disconnected flag. Signed-off-by: Johan Hovold <jhovold@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- drivers/usb/serial/quatech2.c | 7 +++++++ 1 file changed, 7 insertions(+) -- 1.7.9.5