ehci: Add a ehci_writeback_async_complete_packet helper function

Also drop the warning printf, which was there mainly because this was an
untested code path (as the previous bug fixes to it show), but that no
longer is the case now :)

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

hw/usb/hcd-ehci.c

@@ -438,6 +438,22 @@ static inline bool ehci_periodic_enabled(EHCIState *s)
     return ehci_enabled(s) && (s->usbcmd & USBCMD_PSE);
 }
 
+/* Finish executing and writeback a packet outside of the regular
+   fetchqh -> fetchqtd -> execute -> writeback cycle */
+static void ehci_writeback_async_complete_packet(EHCIPacket *p)
+{
+    EHCIQueue *q = p->queue;
+    int state;
+
+    state = ehci_get_state(q->ehci, q->async);
+    ehci_state_executing(q);
+    ehci_state_writeback(q); /* Frees the packet! */
+    if (!(q->qh.token & QTD_TOKEN_HALT)) {
+        ehci_state_advqueue(q);
+    }
+    ehci_set_state(q->ehci, q->async, state);
+}
+
 /* packet management */
 
 static EHCIPacket *ehci_alloc_packet(EHCIQueue *q)
@@ -455,17 +471,7 @@ static EHCIPacket *ehci_alloc_packet(EHCIQueue *q)
 static void ehci_free_packet(EHCIPacket *p)
 {
     if (p->async == EHCI_ASYNC_FINISHED) {
-        EHCIQueue *q = p->queue;
-        int state = ehci_get_state(q->ehci, q->async);
-        /* This is a normal, but rare condition (cancel racing completion) */
-        fprintf(stderr, "EHCI: Warning packet completed but not processed\n");
-        ehci_state_executing(q);
-        ehci_state_writeback(q);
-        if (!(q->qh.token & QTD_TOKEN_HALT)) {
-            ehci_state_advqueue(q);
-        }
-        ehci_set_state(q->ehci, q->async, state);
-        /* state_writeback recurses into us with async == EHCI_ASYNC_NONE!! */
+        ehci_writeback_async_complete_packet(p);
         return;
     }
     trace_usb_ehci_packet_action(p->queue, p, "free");