dwc_otg: fix summarize urb->actual_length for isochronous transfers

Kernel does not copy input data of ISO transfers to userspace
if actual_length is set only in ISO transfers and not summarized
in urb->actual_length. Fixes raspberrypi/linux#903

diff --git a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
index 162a656501988e56c9d780b7793d365fde09f801..992269d61ecf48126379a38e528f719009ee1d75 100644 (file)
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
@@ -334,10 +334,12 @@ static int _complete(dwc_otg_hcd_t * hcd, void *urb_handle,
                int i;
 
                urb->error_count = dwc_otg_hcd_urb_get_error_count(dwc_otg_urb);
+               urb->actual_length = 0;
                for (i = 0; i < urb->number_of_packets; ++i) {
                        urb->iso_frame_desc[i].actual_length =
                            dwc_otg_hcd_urb_get_iso_desc_actual_length
                            (dwc_otg_urb, i);
+                       urb->actual_length += urb->iso_frame_desc[i].actual_length;
                        urb->iso_frame_desc[i].status =
                            dwc_otg_hcd_urb_get_iso_desc_status(dwc_otg_urb, i);
                }