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From 83672d68ed0199fbe119510626116a32622e4003 Mon Sep 17 00:00:00 2001
From: Martin Cerveny <M.Cerveny@computer.org>
Date: Mon, 13 Feb 2017 17:23:47 +0100
Subject: [PATCH] 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
---
drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
+++ b/drivers/usb/host/dwc_otg/dwc_otg_hcd_linux.c
@@ -325,10 +325,12 @@ static int _complete(dwc_otg_hcd_t * hcd
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);
}
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