firewire: allocate broadcast channel in hardware

On OHCI 1.1 controllers, let the hardware allocate the broadcast channel
automatically.  This removes a theoretical race condition directly after
a bus reset where it could be possible to read the channel allocation
register with channel 31 still being unallocated.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c
index ca3c65318165..00a556f3a585 100644
--- a/drivers/firewire/core-topology.c
+++ b/drivers/firewire/core-topology.c
@@ -543,7 +543,8 @@ void fw_core_handle_bus_reset(struct fw_card *card, int node_id, int generation,
 
         spin_lock_irqsave(&card->lock, flags);
 
-        card->broadcast_channel_allocated = false;
+        card->broadcast_channel_allocated = (card->driver->get_features(card) &
+                                             FEATURE_CHANNEL_31_ALLOCATED) != 0;
         card->node_id = node_id;
         /*
          * Update node_id before generation to prevent anybody from using