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Commit 250b2b6d authored by Stefan Richter's avatar Stefan Richter
Browse files

firewire: cdev: fix fw_cdev_event_bus_reset.bm_node_id 



Fix an obscure ABI feature that is a bit of a hassle to implement.
However, somebody put it into the ABI, so let's fill in a sensible
value there.

Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent ae948011

drivers/firewire/core-card.c

+9 −3
Original line number Diff line number Diff line
@@ -239,7 +239,7 @@ static void fw_card_bm_work(struct work_struct *work) 
	struct fw_card *card = container_of(work, struct fw_card, work.work);

	struct fw_device *root_device;

	struct fw_node *root_node;

	int root_id, new_root_id, irm_id, local_id;

	int root_id, new_root_id, irm_id, bm_id, local_id;

	int gap_count, generation, grace, rcode;

	bool do_reset = false;

	bool root_device_is_running;
@@ -301,9 +301,15 @@ static void fw_card_bm_work(struct work_struct *work) 
			/* Another bus reset, BM work has been rescheduled. */

			goto out;



		if (rcode == RCODE_COMPLETE &&

		    card->bm_transaction_data[0] != cpu_to_be32(0x3f)) {

		bm_id = be32_to_cpu(card->bm_transaction_data[0]);



		spin_lock_irq(&card->lock);

		if (rcode == RCODE_COMPLETE && generation == card->generation)

			card->bm_node_id =

			    bm_id == 0x3f ? local_id : 0xffc0 | bm_id;

		spin_unlock_irq(&card->lock);



		if (rcode == RCODE_COMPLETE && bm_id != 0x3f) {

			/* Somebody else is BM.  Only act as IRM. */

			if (local_id == irm_id)

				allocate_broadcast_channel(card, generation);

drivers/firewire/core-cdev.c

+1 −1
Original line number Diff line number Diff line
@@ -318,7 +318,7 @@ static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, 
	event->generation    = client->device->generation;

	event->node_id       = client->device->node_id;

	event->local_node_id = card->local_node->node_id;

	event->bm_node_id    = 0; /* FIXME: We don't track the BM. */

	event->bm_node_id    = card->bm_node_id;

	event->irm_node_id   = card->irm_node->node_id;

	event->root_node_id  = card->root_node->node_id;

drivers/firewire/core-topology.c

+1 −0
Original line number Diff line number Diff line
@@ -552,6 +552,7 @@ void fw_core_handle_bus_reset(struct fw_card *card, int node_id, int generation, 
	smp_wmb();

	card->generation = generation;

	card->reset_jiffies = jiffies;

	card->bm_node_id  = 0xffff;

	card->bm_abdicate = bm_abdicate;

	fw_schedule_bm_work(card, 0);

include/linux/firewire-cdev.h

+5 −0
Original line number Diff line number Diff line
@@ -66,6 +66,10 @@ struct fw_cdev_event_common { 
 * This event is sent when the bus the device belongs to goes through a bus

 * reset.  It provides information about the new bus configuration, such as

 * new node ID for this device, new root ID, and others.

 *

 * If @bm_node_id is 0xffff right after bus reset it can be reread by an

 * %FW_CDEV_IOC_GET_INFO ioctl after bus manager selection was finished.

 * Kernels with ABI version < 4 do not set @bm_node_id.

 */

struct fw_cdev_event_bus_reset {

	__u64 closure;
@@ -348,6 +352,7 @@ union fw_cdev_event { 
 *  3  (2.6.34)  - made &fw_cdev_get_cycle_timer reliable

 *               - added %FW_CDEV_IOC_GET_CYCLE_TIMER2

 *  4  (2.6.36)  - added %FW_CDEV_EVENT_REQUEST2

 *               - implemented &fw_cdev_event_bus_reset.bm_node_id

 */

#define FW_CDEV_VERSION 3 /* Meaningless; don't use this macro. */

include/linux/firewire.h

+1 −0
Original line number Diff line number Diff line
@@ -119,6 +119,7 @@ struct fw_card { 
	int bm_retries;

	int bm_generation;

	__be32 bm_transaction_data[2];

	int bm_node_id;

	bool bm_abdicate;



	bool priority_budget_implemented;	/* controller feature */