firewire: reread config ROM when device reset the bus

When a device changes its configuration ROM, it announces this with a
bus reset.  firewire-core has to check which node initiated a bus reset
and whether any unit directories went away or were added on this node.

Tested with an IOI FWB-IDE01AB which has its link-on bit set if bus
power is available but does not respond to ROM read requests if self
power is off.  This implements
  - recognition of the units if self power is switched on after fw-core
    gave up the initial attempt to read the config ROM,
  - shutdown of the units when self power is switched off.

Also tested with a second PC running Linux/ieee1394.  When the eth1394
driver is inserted and removed on that node, fw-core now notices the
addition and removal of the IPv4 unit on the ieee1394 node.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/firewire/fw-topology.c b/drivers/firewire/fw-topology.c
index d2c7a3d7e1cb..ebdec4c6c689 100644
--- a/drivers/firewire/fw-topology.c
+++ b/drivers/firewire/fw-topology.c
@@ -108,6 +108,7 @@ static struct fw_node *fw_node_create(u32 sid, int port_count, int color)
         node->node_id = LOCAL_BUS | SELF_ID_PHY_ID(sid);
         node->link_on = SELF_ID_LINK_ON(sid);
         node->phy_speed = SELF_ID_PHY_SPEED(sid);
+        node->initiated_reset = SELF_ID_PHY_INITIATOR(sid);
         node->port_count = port_count;
 
         atomic_set(&node->ref_count, 1);
@@ -431,6 +432,8 @@ update_tree(struct fw_card *card, struct fw_node *root)
                         event = FW_NODE_LINK_OFF;
                 else if (!node0->link_on && node1->link_on)
                         event = FW_NODE_LINK_ON;
+                else if (node1->initiated_reset && node1->link_on)
+                        event = FW_NODE_INITIATED_RESET;
                 else
                         event = FW_NODE_UPDATED;