[Xen-changelog] [linux-2.6.18-xen] usbback: fix urb interval value for interrupt urbs.

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1239022280 -3600
# Node ID 950b9eb2766128f85adf52d5aabcd15eb8c77dc0
# Parent  711e402bc1419368b6342d380dfc50940b867cbe
usbback: fix urb interval value for interrupt urbs.

Signed-off-by: Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>
---
 drivers/xen/usbback/usbback.c |   12 ++++++++++++
 1 files changed, 12 insertions(+)

diff -r 711e402bc141 -r 950b9eb27661 drivers/xen/usbback/usbback.c
--- a/drivers/xen/usbback/usbback.c     Mon Apr 06 13:48:03 2009 +0100
+++ b/drivers/xen/usbback/usbback.c     Mon Apr 06 13:51:20 2009 +0100
@@ -470,6 +470,18 @@ static void usbbk_init_urb(usbif_request
                                pending_req->buffer, req->buffer_length,
                                usbbk_urb_complete,
                                pending_req, req->u.intr.interval);
+               /*
+                * high speed interrupt endpoints use a logarithmic encoding of
+                * the endpoint interval, and usb_fill_int_urb() initializes a
+                * interrupt urb with the encoded interval value.
+                *
+                * req->u.intr.interval is the interval value that already
+                * encoded in the frontend part, and the above 
usb_fill_int_urb()
+                * initializes the urb->interval with double encoded value.
+                *
+                * so, simply overwrite the urb->interval with original value.
+                */
+               urb->interval = req->u.intr.interval;
                urb->transfer_flags = req->transfer_flags;
 
                break;

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