Commit 1107aac1ad7f for kernel

commit 1107aac1ad7f445a83604b14af7be47f1a795c66
Author: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Date:   Fri Nov 14 23:44:21 2025 +0900

    firewire: core: fix to update generation field in topology map

    The generation field of topology map is updated after initialized by zero.
    The updated value of generation field is always zero, and is against
    specification.

    This commit fixes the bug.

    Fixes: 7d138cb269db ("firewire: core: use spin lock specific to topology map")
    Link: https://lore.kernel.org/r/20251114144421.415278-1-o-takashi@sakamocchi.jp
    Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c
index 2f73bcd5696f..ed3ae8cdb0cd 100644
--- a/drivers/firewire/core-topology.c
+++ b/drivers/firewire/core-topology.c
@@ -441,12 +441,13 @@ static void update_topology_map(__be32 *buffer, size_t buffer_size, int root_nod
 				const u32 *self_ids, int self_id_count)
 {
 	__be32 *map = buffer;
+	u32 next_generation = be32_to_cpu(buffer[1]) + 1;
 	int node_count = (root_node_id & 0x3f) + 1;

 	memset(map, 0, buffer_size);

 	*map++ = cpu_to_be32((self_id_count + 2) << 16);
-	*map++ = cpu_to_be32(be32_to_cpu(buffer[1]) + 1);
+	*map++ = cpu_to_be32(next_generation);
 	*map++ = cpu_to_be32((node_count << 16) | self_id_count);

 	while (self_id_count--)