This patch has been created from AVM's opensrc packages for 7390.06.23 and 7390.06.30
by applying to the kernel sources they contain the following command:

    diff -durN --no-dereference 7390.06.23 7390.06.30 > this.patch

--- linux-2.6.28/net/avm_pa/avm_pa_fusiv.c
+++ linux-2.6.28/net/avm_pa/avm_pa_fusiv.c
@@ -584,7 +584,11 @@
    priority = (priority & TC_H_MIN_MASK);
    if (priority > 7)
       priority = 7;
-   flow.egressList[0].pFlowID = (void *) (priority << 16);
+   
+   if (egress_hw->apId == PERI_ID || egress_hw->apId == ATM_ID)
+      flow.egressList[0].pFlowID = (void *) (priority << 16);
+   else
+      flow.egressList[0].pFlowID = (void *) (priority);
 
    if (egress_hw->apId != PERI_ID) {
       mtu = avm_session->egress[0].mtu;
@@ -853,7 +857,10 @@
       (unsigned int) &fusiv_session_array[avm_session->session_handle];
    flow.egressList[0].pEgress =
       (void *) (K1_TO_PHYS(apArray[egress_hw->apId].apTxFifo));
-   flow.egressList[0].pFlowID = (void *) (priority << 16);
+   if (egress_hw->apId == PERI_ID || egress_hw->apId == ATM_ID)
+      flow.egressList[0].pFlowID = (void *) (priority << 16);
+   else
+      flow.egressList[0].pFlowID = (void *) (priority);
    flow.operations |= (0x1 << AP_ROUTE_VALID_BIT);
 
    flowhash = apIpv6CalculateHash(ingress_hw->apId, &flow);