USB: serial: option: clean up urb->status usage

This done in anticipation of removal of urb->status, which will make
that patch easier to review and apply in the future.


Cc: <linux-usb-devel@lists.sourceforge.net>
Cc: Matthias Urlichs <smurf@smurf.noris.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/option.c

@@ -416,15 +416,16 @@ static void option_indat_callback(struct urb *urb)
 	struct usb_serial_port *port;
 	struct tty_struct *tty;
 	unsigned char *data = urb->transfer_buffer;
+	int status = urb->status;
 
 	dbg("%s: %p", __FUNCTION__, urb);
 
 	endpoint = usb_pipeendpoint(urb->pipe);
 	port = (struct usb_serial_port *) urb->context;
 
-	if (urb->status) {
+	if (status) {
 		dbg("%s: nonzero status: %d on endpoint %02x.",
-		    __FUNCTION__, urb->status, endpoint);
+		    __FUNCTION__, status, endpoint);
 	} else {
 		tty = port->tty;
 		if (urb->actual_length) {
@@ -436,7 +437,7 @@ static void option_indat_callback(struct urb *urb)
 		}
 
 		/* Resubmit urb so we continue receiving */
-		if (port->open_count && urb->status != -ESHUTDOWN) {
+		if (port->open_count && status != -ESHUTDOWN) {
 			err = usb_submit_urb(urb, GFP_ATOMIC);
 			if (err)
 				printk(KERN_ERR "%s: resubmit read urb failed. "
@@ -471,6 +472,7 @@ static void option_outdat_callback(struct urb *urb)
 static void option_instat_callback(struct urb *urb)
 {
 	int err;
+	int status = urb->status;
 	struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 	struct option_port_private *portdata = usb_get_serial_port_data(port);
 	struct usb_serial *serial = port->serial;
@@ -478,7 +480,7 @@ static void option_instat_callback(struct urb *urb)
 	dbg("%s", __FUNCTION__);
 	dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);
 
-	if (urb->status == 0) {
+	if (status == 0) {
 		struct usb_ctrlrequest *req_pkt =
 				(struct usb_ctrlrequest *)urb->transfer_buffer;
 
@@ -509,10 +511,10 @@ static void option_instat_callback(struct urb *urb)
 				req_pkt->bRequestType,req_pkt->bRequest);
 		}
 	} else
-		dbg("%s: error %d", __FUNCTION__, urb->status);
+		dbg("%s: error %d", __FUNCTION__, status);
 
 	/* Resubmit urb so we continue receiving IRQ data */
-	if (urb->status != -ESHUTDOWN) {
+	if (status != -ESHUTDOWN) {
 		urb->dev = serial->dev;
 		err = usb_submit_urb(urb, GFP_ATOMIC);
 		if (err)