[PATCH v1 18/49] USB: serial: quatech2: prepare for enabling irq in complete()

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Complete() will be run with interrupt enabled, so change to
spin_lock_irqsave().

Cc: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
---
 drivers/usb/serial/quatech2.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index a24d59a..4daa5c9 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -632,16 +632,17 @@ static void qt2_write_bulk_callback(struct urb *urb)
 {
 	struct usb_serial_port *port;
 	struct qt2_port_private *port_priv;
+	unsigned long flags;
 
 	port = urb->context;
 	port_priv = usb_get_serial_port_data(port);
 
-	spin_lock(&port_priv->urb_lock);
+	spin_lock_irqsave(&port_priv->urb_lock, flags);
 
 	port_priv->urb_in_use = false;
 	usb_serial_port_softint(port);
 
-	spin_unlock(&port_priv->urb_lock);
+	spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 
 }
 
-- 
1.7.9.5

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