firewire: Add a bus reset event type for fw-device-cdev.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/firewire/fw-device-cdev.c b/drivers/firewire/fw-device-cdev.c
index 33fe5768a078..9f3c96c7af29 100644
--- a/drivers/firewire/fw-device-cdev.c
+++ b/drivers/firewire/fw-device-cdev.c
@@ -50,6 +50,11 @@ struct event {
         struct list_head link;
 };
 
+struct bus_reset {
+        struct event event;
+        struct fw_cdev_event_bus_reset reset;
+};
+
 struct response {
         struct event event;
         struct fw_transaction transaction;
@@ -75,6 +80,8 @@ struct client {
         struct fw_iso_context *iso_context;
         struct fw_iso_buffer buffer;
         unsigned long vm_start;
+
+        struct list_head link;
 };
 
 static inline void __user *
@@ -93,6 +100,7 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
 {
         struct fw_device *device;
         struct client *client;
+        unsigned long flags;
 
         device = container_of(inode->i_cdev, struct fw_device, cdev);
 
@@ -110,6 +118,10 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
 
         file->private_data = client;
 
+        spin_lock_irqsave(&device->card->lock, flags);
+        list_add_tail(&client->link, &device->client_list);
+        spin_unlock_irqrestore(&device->card->lock, flags);
+
         return 0;
 }
 
@@ -177,6 +189,45 @@ fw_device_op_read(struct file *file,
         return dequeue_event(client, buffer, count);
 }
 
+static void
+queue_bus_reset_event(struct client *client)
+{
+        struct bus_reset *bus_reset;
+        struct fw_device *device = client->device;
+        struct fw_card *card = device->card;
+
+        bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC);
+        if (bus_reset == NULL) {
+                fw_notify("Out of memory when allocating bus reset event\n");
+                return;
+        }
+
+        bus_reset->reset.type          = FW_CDEV_EVENT_BUS_RESET;
+        bus_reset->reset.node_id       = device->node_id;
+        bus_reset->reset.local_node_id = card->local_node->node_id;
+        bus_reset->reset.bm_node_id    = 0; /* FIXME: We don't track the BM. */
+        bus_reset->reset.irm_node_id   = card->irm_node->node_id;
+        bus_reset->reset.root_node_id  = card->root_node->node_id;
+        bus_reset->reset.generation    = card->generation;
+
+        queue_event(client, &bus_reset->event,
+                    &bus_reset->reset, sizeof bus_reset->reset, NULL, 0);
+}
+
+void fw_device_cdev_update(struct fw_device *device)
+{
+        struct fw_card *card = device->card;
+        struct client *c;
+        unsigned long flags;
+
+        spin_lock_irqsave(&card->lock, flags);
+
+        list_for_each_entry(c, &device->client_list, link)
+                queue_bus_reset_event(c);
+
+        spin_unlock_irqrestore(&card->lock, flags);
+}
+
 static int ioctl_config_rom(struct client *client, void __user *arg)
 {
         struct fw_cdev_get_config_rom rom;
@@ -633,6 +684,7 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
         struct client *client = file->private_data;
         struct address_handler *h, *next;
         struct request *r, *next_r;
+        unsigned long flags;
 
         if (client->buffer.pages)
                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
@@ -657,6 +709,10 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
         while (!list_empty(&client->event_list))
                 dequeue_event(client, NULL, 0);
 
+        spin_lock_irqsave(&client->device->card->lock, flags);
+        list_del(&client->link);
+        spin_unlock_irqrestore(&client->device->card->lock, flags);
+
         fw_device_put(client->device);
         kfree(client);