1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 5b15d9d8896b..2bfc41ece0e1 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -387,7 +387,6 @@ static void acm_rx_tasklet(unsigned long _acm)
         struct acm_ru *rcv;
         unsigned long flags;
         unsigned char throttled;
-        struct usb_host_endpoint *ep;
 
         dbg("Entering acm_rx_tasklet");
 
@@ -463,14 +462,12 @@ urbs:
 
                 rcv->buffer = buf;
 
-                ep = (usb_pipein(acm->rx_endpoint) ? acm->dev->ep_in : acm->dev->ep_out)
-                                [usb_pipeendpoint(acm->rx_endpoint)];
-                if (usb_endpoint_xfer_int(&ep->desc))
+                if (acm->is_int_ep)
                         usb_fill_int_urb(rcv->urb, acm->dev,
                                          acm->rx_endpoint,
                                          buf->base,
                                          acm->readsize,
-                                         acm_read_bulk, rcv, ep->desc.bInterval);
+                                         acm_read_bulk, rcv, acm->bInterval);
                 else
                         usb_fill_bulk_urb(rcv->urb, acm->dev,
                                           acm->rx_endpoint,
@@ -750,7 +747,7 @@ static int acm_tty_chars_in_buffer(struct tty_struct *tty)
 {
         struct acm *acm = tty->driver_data;
         if (!ACM_READY(acm))
-                return -EINVAL;
+                return 0;
         /*
          * This is inaccurate (overcounts), but it works.
          */
@@ -1183,6 +1180,9 @@ made_compressed_probe:
         spin_lock_init(&acm->read_lock);
         mutex_init(&acm->mutex);
         acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
+        acm->is_int_ep = usb_endpoint_xfer_int(epread);
+        if (acm->is_int_ep)
+                acm->bInterval = epread->bInterval;
         tty_port_init(&acm->port);
         acm->port.ops = &acm_port_ops;