ieee1394: save RAM by using a single tlabel for broadcast transactions

Since broadcast transactions are already complete when the request has
been sent, the same transaction label can be reused all over again, see
IEEE 1394 7.3.2.5 and 6.2.4.3.  Therefore we can reduce the footprint
of struct hpsb_host by the size of one struct hpsb_tlabel_pool.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/ieee1394/ieee1394_transactions.c b/drivers/ieee1394/ieee1394_transactions.c
index 3fe2f6c4a253..a114b91d606d 100644
--- a/drivers/ieee1394/ieee1394_transactions.c
+++ b/drivers/ieee1394/ieee1394_transactions.c
@@ -136,8 +136,11 @@ int hpsb_get_tlabel(struct hpsb_packet *packet)
 {
         unsigned long flags;
         struct hpsb_tlabel_pool *tp;
+        int n = NODEID_TO_NODE(packet->node_id);
 
-        tp = &packet->host->tpool[packet->node_id & NODE_MASK];
+        if (unlikely(n == ALL_NODES))
+                return 0;
+        tp = &packet->host->tpool[n];
 
         if (irqs_disabled() || in_atomic()) {
                 if (down_trylock(&tp->count))
@@ -175,8 +178,11 @@ void hpsb_free_tlabel(struct hpsb_packet *packet)
 {
         unsigned long flags;
         struct hpsb_tlabel_pool *tp;
+        int n = NODEID_TO_NODE(packet->node_id);
 
-        tp = &packet->host->tpool[packet->node_id & NODE_MASK];
+        if (unlikely(n == ALL_NODES))
+                return;
+        tp = &packet->host->tpool[n];
 
         BUG_ON(packet->tlabel > 63 || packet->tlabel < 0);