From: =?utf-8?q?Kristian_H=C3=B8gsberg?= Subject: firewire: Don't set card->irm_node before we have a new valid topology. Date: Tue, 27 Mar 2007 09:42:39 -0500 In case the topology build fails, we want to retain the old topology info until another reset finishes and results in a valid new tree. If we clear card->irm_node to NULL and the topology build fails, we end up dereferencing a NULL pointer in a few places. Signed-off-by: Kristian Høgsberg Signed-off-by: Stefan Richter --- drivers/firewire/fw-topology.c | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/firewire/fw-topology.c b/drivers/firewire/fw-topology.c index 7923463..d3e7aac 100644 --- a/drivers/firewire/fw-topology.c +++ b/drivers/firewire/fw-topology.c @@ -166,7 +166,7 @@ static void update_hop_count(struct fw_node *node) static struct fw_node *build_tree(struct fw_card *card, u32 *sid, int self_id_count) { - struct fw_node *node, *child, *local_node; + struct fw_node *node, *child, *local_node, *irm_node; struct list_head stack, *h; u32 *next_sid, *end, q; int i, port_count, child_port_count, phy_id, parent_count, stack_depth; @@ -178,7 +178,7 @@ static struct fw_node *build_tree(struct fw_card *card, stack_depth = 0; end = sid + self_id_count; phy_id = 0; - card->irm_node = NULL; + irm_node = NULL; gap_count = self_id_gap_count(*sid); topology_type = 0; @@ -218,7 +218,7 @@ static struct fw_node *build_tree(struct fw_card *card, local_node = node; if (self_id_contender(q)) - card->irm_node = node; + irm_node = node; if (node->phy_speed == SCODE_BETA) topology_type |= FW_TOPOLOGY_B; @@ -282,6 +282,7 @@ static struct fw_node *build_tree(struct fw_card *card, } card->root_node = node; + card->irm_node = irm_node; card->gap_count = gap_count; card->topology_type = topology_type; -- 1.5.0.5