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USB: serial: quatech2: fix sleep-while-atomic in close

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commit f09d1886a4 upstream.

The write URB was being killed using the synchronous interface while
holding a spin lock in close().

Simply drop the lock and busy-flag update, something which would have
been taken care of by the completion handler if the URB was in flight.

Fixes: f7a33e608d ("USB: serial: add quatech2 usb to serial driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold
2017-01-03 16:40:01 +01:00
committed by Greg Kroah-Hartman
parent 6ae3e89aa6
commit 2a4ae7bc3d
1 changed files with 0 additions and 4 deletions
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4
drivers/usb/serial/quatech2.c
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@@ -408,16 +408,12 @@ static void qt2_close(struct usb_serial_port *port)
{
struct usb_serial *serial;
struct qt2_port_private *port_priv;
unsigned long flags;
int i;
serial = port->serial;
port_priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&port_priv->urb_lock, flags);
usb_kill_urb(port_priv->write_urb);
port_priv->urb_in_use = false;
spin_unlock_irqrestore(&port_priv->urb_lock, flags);
/* flush the port transmit buffer */
i = usb_control_msg(serial->dev,