This is a note to let you know that I've just added the patch titled
USB: quatech2: fix io after disconnect
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 2f0295adf6438188c4cd0868f2b1976a2b034e1d Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Thu, 25 Oct 2012 10:29:10 +0200
Subject: USB: quatech2: fix io after disconnect
Make sure no control urb is submitted during close after a disconnect by
checking the disconnected flag.
Cc: <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/usb/serial/quatech2.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index 7e8d8f3..ffcfc96 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)
--
1.7.12.2.421.g261b511
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