firewire: core: optimize Topology Map creation

The Topology Map of the local node was created in CPU byte order,
then a temporary big endian copy was created to compute the CRC,
and when a read request to the Topology Map arrived it had to be
converted to big endian byte order again.

We now generate it in big endian byte order in the first place.
This also rids us of 1000 bytes stack usage in tasklet context.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 2 insertions, 7 deletions

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index da628c72a46..203e6428bad 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -810,8 +810,7 @@ static void handle_topology_map(struct fw_card *card, struct fw_request *request
                 int speed, unsigned long long offset,
                 void *payload, size_t length, void *callback_data)
 {
-        int i, start, end;
-        __be32 *map;
+        int start;
 
         if (!TCODE_IS_READ_REQUEST(tcode)) {
                 fw_send_response(card, request, RCODE_TYPE_ERROR);
@@ -824,11 +823,7 @@ static void handle_topology_map(struct fw_card *card, struct fw_request *request
         }
 
         start = (offset - topology_map_region.start) / 4;
-        end = start + length / 4;
-        map = payload;
-
-        for (i = 0; i < length / 4; i++)
-                map[i] = cpu_to_be32(card->topology_map[start + i]);
+        memcpy(payload, &card->topology_map[start], length);
 
         fw_send_response(card, request, RCODE_COMPLETE);
 }