USB: option.c: option_indat_callback: Resubmit some unsuccessful URBs

All unsuccessful (non-zero status) URBs were being dropped. After N_IN_URBs are
dropped you will no longer be able to receive data.

This patch resubmits unsuccessful URBs unless the status indicates that it should
be terminated. The statuses that indicate the URB should be terminated was
gathered from other similar drivers.
Signed-off-by: James Maki <jamescmaki@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/option.c

@@ -1019,31 +1019,42 @@ static void option_indat_callback(struct urb *urb)
 	dbg("%s: %p", __func__, urb);
 
 	endpoint = usb_pipeendpoint(urb->pipe);
-	port =  urb->context;
-
-	if (status) {
+	port = urb->context;
+
+	switch (status) {
+	case 0:
+		/* success */
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		/* this urb is terminated, clean up */
+		dbg("%s: urb shutting down with status: %d on endpoint %02x.",
+		    __func__, status, endpoint);
+		return;
+	default:
 		dbg("%s: nonzero status: %d on endpoint %02x.",
 		    __func__, status, endpoint);
-	} else {
+		goto exit;
+	}
+
+	if (urb->actual_length) {
 		tty = tty_port_tty_get(&port->port);
-		if (urb->actual_length) {
-			tty_insert_flip_string(tty, data, urb->actual_length);
-			tty_flip_buffer_push(tty);
-		} else 
-			dbg("%s: empty read urb received", __func__);
+		tty_insert_flip_string(tty, data, urb->actual_length);
+		tty_flip_buffer_push(tty);
 		tty_kref_put(tty);
+	} else
+		dbg("%s: empty read urb received", __func__);
 
-		/* Resubmit urb so we continue receiving */
-		if (status != -ESHUTDOWN) {
-			err = usb_submit_urb(urb, GFP_ATOMIC);
-			if (err && err != -EPERM)
-				printk(KERN_ERR "%s: resubmit read urb failed. "
-					"(%d)", __func__, err);
-			else
-				usb_mark_last_busy(port->serial->dev);
-		}
+exit:
+	/* Resubmit urb so we continue receiving */
+	err = usb_submit_urb(urb, GFP_ATOMIC);
+	if (err && err != -EPERM)
+		printk(KERN_ERR "%s: resubmit read urb failed. "
+			"(%d)", __func__, err);
+	else
+		usb_mark_last_busy(port->serial->dev);
 
-	}
 	return;
 }