[Xen-changelog] [qemu-upstream-unstable] usb-bt: Return NAK instead of STALL when interrupt ep has no data

[patchbot@xxxxxxx]

commit 33c1a6856f06fccd7cbfe53e06f9ebbe95bd565f
Author: Hans de Goede <hdegoede@xxxxxxxxxx>
Date:   Sat Nov 17 12:15:01 2012 +0100

    usb-bt: Return NAK instead of STALL when interrupt ep has no data
    
    I noticed this while making all devices with interrupt endpoints properly
    do wakeup. While at it also add wakeup support.
    
    Note that I've not tested this, but returning STALL for an interrupt ep
    which has no data is cleary the wrong thing to do.
    
    Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
    Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
 hw/usb/dev-bluetooth.c |   25 +++++++++++++++++++++----
 1 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/hw/usb/dev-bluetooth.c b/hw/usb/dev-bluetooth.c
index bfb96bf..39984f5 100644
--- a/hw/usb/dev-bluetooth.c
+++ b/hw/usb/dev-bluetooth.c
@@ -27,6 +27,7 @@
 struct USBBtState {
     USBDevice dev;
     struct HCIInfo *hci;
+    USBEndpoint *intr;
 
     int config;
 
@@ -290,10 +291,7 @@ static inline void usb_bt_fifo_dequeue(struct 
usb_hci_in_fifo_s *fifo,
 {
     int len;
 
-    if (likely(!fifo->len)) {
-        p->status = USB_RET_STALL;
-        return;
-    }
+    assert(fifo->len != 0);
 
     len = MIN(p->iov.size, fifo->fifo[fifo->start].len);
     usb_packet_copy(p, fifo->fifo[fifo->start].data, len);
@@ -422,14 +420,26 @@ static void usb_bt_handle_data(USBDevice *dev, USBPacket 
*p)
     case USB_TOKEN_IN:
         switch (p->ep->nr) {
         case USB_EVT_EP:
+            if (s->evt.len == 0) {
+                p->status = USB_RET_NAK;
+                break;
+            }
             usb_bt_fifo_dequeue(&s->evt, p);
             break;
 
         case USB_ACL_EP:
+            if (s->evt.len == 0) {
+                p->status = USB_RET_STALL;
+                break;
+            }
             usb_bt_fifo_dequeue(&s->acl, p);
             break;
 
         case USB_SCO_EP:
+            if (s->evt.len == 0) {
+                p->status = USB_RET_STALL;
+                break;
+            }
             usb_bt_fifo_dequeue(&s->sco, p);
             break;
 
@@ -467,6 +477,9 @@ static void usb_bt_out_hci_packet_event(void *opaque,
 {
     struct USBBtState *s = (struct USBBtState *) opaque;
 
+    if (s->evt.len == 0) {
+        usb_wakeup(s->intr);
+    }
     usb_bt_fifo_enqueue(&s->evt, data, len);
 }
 
@@ -489,8 +502,12 @@ static void usb_bt_handle_destroy(USBDevice *dev)
 
 static int usb_bt_initfn(USBDevice *dev)
 {
+    struct USBBtState *s = DO_UPCAST(struct USBBtState, dev, dev);
+
     usb_desc_create_serial(dev);
     usb_desc_init(dev);
+    s->intr = usb_ep_get(dev, USB_TOKEN_IN, USB_EVT_EP);
+
     return 0;
 }
 
--
generated by git-patchbot for /home/xen/git/qemu-upstream-unstable.git

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