[Qemu-devel] [5070] uhci: Fixed length handling for SETUP and OUT tokens

[Aurelien Jarno]

Revision: 5070
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5070
Author:   aurel32
Date:     2008-08-22 08:58:08 +0000 (Fri, 22 Aug 2008)

Log Message:
-----------
uhci: Fixed length handling for SETUP and OUT tokens

Fixes regression reported agains Linux 2.6.18.
Looks like XP and newer Linux kernels are less sensitive
to length returned for control transfers.

Signed-off-by: Max Krasnyansky <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>

Modified Paths:
--------------
    trunk/hw/usb-uhci.c

Modified: trunk/hw/usb-uhci.c
===================================================================
--- trunk/hw/usb-uhci.c 2008-08-22 08:58:00 UTC (rev 5069)
+++ trunk/hw/usb-uhci.c 2008-08-22 08:58:08 UTC (rev 5070)
@@ -635,7 +635,7 @@
 
     dprintf("uhci: packet enter. pid %s addr 0x%02x ep %d len %d\n",
            pid2str(p->pid), p->devaddr, p->devep, p->len);
-    if (p->pid == USB_TOKEN_OUT)
+    if (p->pid == USB_TOKEN_OUT || p->pid == USB_TOKEN_SETUP)
         dump_data(p->data, p->len);
 
     ret = USB_RET_NODEV;
@@ -755,7 +755,7 @@
 static int uhci_handle_td(UHCIState *s, uint32_t addr, UHCI_TD *td, uint32_t 
*int_mask)
 {
     UHCIAsync *async;
-    int len = 0, max_len, ret = 0;
+    int len = 0, max_len;
     uint8_t pid;
 
     /* Is active ? */
@@ -798,12 +798,13 @@
     case USB_TOKEN_OUT:
     case USB_TOKEN_SETUP:
         cpu_physical_memory_read(td->buffer, async->buffer, max_len);
-        ret = uhci_broadcast_packet(s, &async->packet);
-        len = max_len;
+        len = uhci_broadcast_packet(s, &async->packet);
+        if (len >= 0)
+            len = max_len;
         break;
 
     case USB_TOKEN_IN:
-        ret = uhci_broadcast_packet(s, &async->packet);
+        len = uhci_broadcast_packet(s, &async->packet);
         break;
 
     default:
@@ -814,17 +815,17 @@
         return -1;
     }
  
-    if (ret == USB_RET_ASYNC) {
+    if (len == USB_RET_ASYNC) {
         uhci_async_link(s, async);
         return 2;
     }
 
-    async->packet.len = ret;
+    async->packet.len = len;
 
 done:
-    ret = uhci_complete_td(s, td, async, int_mask);
+    len = uhci_complete_td(s, td, async, int_mask);
     uhci_async_free(s, async);
-    return ret;
+    return len;
 }
 
 static void uhci_async_complete(USBPacket *packet, void *opaque)