diff options
Diffstat (limited to 'drivers/firewire/fw-device.c')
| -rw-r--r-- | drivers/firewire/fw-device.c | 101 |
1 files changed, 66 insertions, 35 deletions
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c index 99d1c418d2b0..8e5f17f5e98a 100644 --- a/drivers/firewire/fw-device.c +++ b/drivers/firewire/fw-device.c @@ -1,6 +1,5 @@ -/* -*- c-basic-offset: 8 -*- - * - * fw-device.c - Device probing and sysfs code. +/* + * Device probing and sysfs code. * * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net> * @@ -174,8 +173,10 @@ static void fw_device_release(struct device *dev) struct fw_device *device = fw_device(dev); unsigned long flags; - /* Take the card lock so we don't set this to NULL while a - * FW_NODE_UPDATED callback is being handled. */ + /* + * Take the card lock so we don't set this to NULL while a + * FW_NODE_UPDATED callback is being handled. + */ spin_lock_irqsave(&device->card->lock, flags); device->node->data = NULL; spin_unlock_irqrestore(&device->card->lock, flags); @@ -421,34 +422,42 @@ static int read_bus_info_block(struct fw_device *device) for (i = 0; i < 5; i++) { if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) return -1; - /* As per IEEE1212 7.2, during power-up, devices can + /* + * As per IEEE1212 7.2, during power-up, devices can * reply with a 0 for the first quadlet of the config * rom to indicate that they are booting (for example, * if the firmware is on the disk of a external * harddisk). In that case we just fail, and the - * retry mechanism will try again later. */ + * retry mechanism will try again later. + */ if (i == 0 && rom[i] == 0) return -1; } - /* Now parse the config rom. The config rom is a recursive + /* + * Now parse the config rom. The config rom is a recursive * directory structure so we parse it using a stack of * references to the blocks that make up the structure. We * push a reference to the root directory on the stack to - * start things off. */ + * start things off. + */ length = i; sp = 0; stack[sp++] = 0xc0000005; while (sp > 0) { - /* Pop the next block reference of the stack. The + /* + * Pop the next block reference of the stack. The * lower 24 bits is the offset into the config rom, * the upper 8 bits are the type of the reference the - * block. */ + * block. + */ key = stack[--sp]; i = key & 0xffffff; if (i >= ARRAY_SIZE(rom)) - /* The reference points outside the standard - * config rom area, something's fishy. */ + /* + * The reference points outside the standard + * config rom area, something's fishy. + */ return -1; /* Read header quadlet for the block to get the length. */ @@ -457,15 +466,19 @@ static int read_bus_info_block(struct fw_device *device) end = i + (rom[i] >> 16) + 1; i++; if (end > ARRAY_SIZE(rom)) - /* This block extends outside standard config + /* + * This block extends outside standard config * area (and the array we're reading it * into). That's broken, so ignore this - * device. */ + * device. + */ return -1; - /* Now read in the block. If this is a directory + /* + * Now read in the block. If this is a directory * block, check the entries as we read them to see if - * it references another block, and push it in that case. */ + * it references another block, and push it in that case. + */ while (i < end) { if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) return -1; @@ -516,8 +529,10 @@ static void create_units(struct fw_device *device) if (key != (CSR_UNIT | CSR_DIRECTORY)) continue; - /* Get the address of the unit directory and try to - * match the drivers id_tables against it. */ + /* + * Get the address of the unit directory and try to + * match the drivers id_tables against it. + */ unit = kzalloc(sizeof *unit, GFP_KERNEL); if (unit == NULL) { fw_error("failed to allocate memory for unit\n"); @@ -585,14 +600,16 @@ static struct device_type fw_device_type = { .release = fw_device_release, }; -/* These defines control the retry behavior for reading the config +/* + * These defines control the retry behavior for reading the config * rom. It shouldn't be necessary to tweak these; if the device * doesn't respond to a config rom read within 10 seconds, it's not * going to respond at all. As for the initial delay, a lot of * devices will be able to respond within half a second after bus * reset. On the other hand, it's not really worth being more * aggressive than that, since it scales pretty well; if 10 devices - * are plugged in, they're all getting read within one second. */ + * are plugged in, they're all getting read within one second. + */ #define MAX_RETRIES 10 #define RETRY_DELAY (3 * HZ) @@ -604,9 +621,11 @@ static void fw_device_init(struct work_struct *work) container_of(work, struct fw_device, work.work); int minor, err; - /* All failure paths here set node->data to NULL, so that we + /* + * All failure paths here set node->data to NULL, so that we * don't try to do device_for_each_child() on a kfree()'d - * device. */ + * device. + */ if (read_bus_info_block(device) < 0) { if (device->config_rom_retries < MAX_RETRIES) { @@ -647,13 +666,15 @@ static void fw_device_init(struct work_struct *work) create_units(device); - /* Transition the device to running state. If it got pulled + /* + * Transition the device to running state. If it got pulled * out from under us while we did the intialization work, we * have to shut down the device again here. Normally, though, * fw_node_event will be responsible for shutting it down when * necessary. We have to use the atomic cmpxchg here to avoid * racing with the FW_NODE_DESTROYED case in - * fw_node_event(). */ + * fw_node_event(). + */ if (atomic_cmpxchg(&device->state, FW_DEVICE_INITIALIZING, FW_DEVICE_RUNNING) == FW_DEVICE_SHUTDOWN) @@ -662,10 +683,12 @@ static void fw_device_init(struct work_struct *work) fw_notify("created new fw device %s (%d config rom retries)\n", device->device.bus_id, device->config_rom_retries); - /* Reschedule the IRM work if we just finished reading the + /* + * Reschedule the IRM work if we just finished reading the * root node config rom. If this races with a bus reset we * just end up running the IRM work a couple of extra times - - * pretty harmless. */ + * pretty harmless. + */ if (device->node == device->card->root_node) schedule_delayed_work(&device->card->work, 0); @@ -716,12 +739,14 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event) if (device == NULL) break; - /* Do minimal intialization of the device here, the + /* + * Do minimal intialization of the device here, the * rest will happen in fw_device_init(). We need the * card and node so we can read the config rom and we * need to do device_initialize() now so * device_for_each_child() in FW_NODE_UPDATED is - * doesn't freak out. */ + * doesn't freak out. + */ device_initialize(&device->device); atomic_set(&device->state, FW_DEVICE_INITIALIZING); device->card = fw_card_get(card); @@ -730,15 +755,19 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event) device->generation = card->generation; INIT_LIST_HEAD(&device->client_list); - /* Set the node data to point back to this device so + /* + * Set the node data to point back to this device so * FW_NODE_UPDATED callbacks can update the node_id - * and generation for the device. */ + * and generation for the device. + */ node->data = device; - /* Many devices are slow to respond after bus resets, + /* + * Many devices are slow to respond after bus resets, * especially if they are bus powered and go through * power-up after getting plugged in. We schedule the - * first config rom scan half a second after bus reset. */ + * first config rom scan half a second after bus reset. + */ INIT_DELAYED_WORK(&device->work, fw_device_init); schedule_delayed_work(&device->work, INITIAL_DELAY); break; @@ -761,7 +790,8 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event) if (!node->data) break; - /* Destroy the device associated with the node. There + /* + * Destroy the device associated with the node. There * are two cases here: either the device is fully * initialized (FW_DEVICE_RUNNING) or we're in the * process of reading its config rom @@ -770,7 +800,8 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event) * full fw_device_shutdown(). If not, there's work * scheduled to read it's config rom, and we just put * the device in shutdown state to have that code fail - * to create the device. */ + * to create the device. + */ device = node->data; if (atomic_xchg(&device->state, FW_DEVICE_SHUTDOWN) == FW_DEVICE_RUNNING) { |