firewire: core: optimize propagation of BROADCAST_CHANNEL

Cache the test result of whether a device implements BROADCAST_CHANNEL.
This minimizes traffic on the bus after each bus reset.  A majority of
devices does not implement BROADCAST_CHANNEL.

Remove busy retries; just rely on the hardware to retry requests to busy
responders.  Remove unnecessary log messages.

Rename the flag is_irm to broadcast_channel_allocated to better reflect
its meaning.  Reset the flag earlier in fw_core_handle_bus_reset.

Pass the generation down as a call parameter; that way generation can't
be newer than card->broadcast_channel_allocated and device->node_id.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/firewire/fw-device.h b/drivers/firewire/fw-device.h
index 3085a74669b5..97588937c018 100644
--- a/drivers/firewire/fw-device.h
+++ b/drivers/firewire/fw-device.h
@@ -71,7 +71,6 @@ struct fw_device {
         int node_id;
         int generation;
         unsigned max_speed;
-        bool cmc;
         struct fw_card *card;
         struct device device;
 
@@ -81,6 +80,9 @@ struct fw_device {
         u32 *config_rom;
         size_t config_rom_length;
         int config_rom_retries;
+        unsigned cmc:1;
+        unsigned bc_implemented:2;
+
         struct delayed_work work;
         struct fw_attribute_group attribute_group;
 };
@@ -109,6 +111,7 @@ static inline void fw_device_put(struct fw_device *device)
 
 struct fw_device *fw_device_get_by_devt(dev_t devt);
 int fw_device_enable_phys_dma(struct fw_device *device);
+void fw_device_set_broadcast_channel(struct fw_device *device, int generation);
 
 void fw_device_cdev_update(struct fw_device *device);
 void fw_device_cdev_remove(struct fw_device *device);