diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firewire/fw-device.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c index 872df2238609..de9066e69adf 100644 --- a/drivers/firewire/fw-device.c +++ b/drivers/firewire/fw-device.c @@ -390,12 +390,12 @@ complete_transaction(struct fw_card *card, int rcode, complete(&callback_data->done); } -static int read_rom(struct fw_device *device, int index, u32 * data) +static int +read_rom(struct fw_device *device, int generation, int index, u32 *data) { struct read_quadlet_callback_data callback_data; struct fw_transaction t; u64 offset; - int generation = device->generation; /* device->node_id, accessed below, must not be older than generation */ smp_rmb(); @@ -414,7 +414,14 @@ static int read_rom(struct fw_device *device, int index, u32 * data) return callback_data.rcode; } -static int read_bus_info_block(struct fw_device *device) +/* + * Read the bus info block, perform a speed probe, and read all of the rest of + * the config ROM. We do all this with a cached bus generation. If the bus + * generation changes under us, read_bus_info_block will fail and get retried. + * It's better to start all over in this case because the node from which we + * are reading the ROM may have changed the ROM during the reset. + */ +static int read_bus_info_block(struct fw_device *device, int generation) { static u32 rom[256]; u32 stack[16], sp, key; @@ -424,7 +431,7 @@ static int read_bus_info_block(struct fw_device *device) /* First read the bus info block. */ for (i = 0; i < 5; i++) { - if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) + if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) return -1; /* * As per IEEE1212 7.2, during power-up, devices can @@ -459,7 +466,8 @@ static int read_bus_info_block(struct fw_device *device) device->max_speed = device->card->link_speed; while (device->max_speed > SCODE_100) { - if (read_rom(device, 0, &dummy) == RCODE_COMPLETE) + if (read_rom(device, generation, 0, &dummy) == + RCODE_COMPLETE) break; device->max_speed--; } @@ -492,7 +500,7 @@ static int read_bus_info_block(struct fw_device *device) return -1; /* Read header quadlet for the block to get the length. */ - if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) + if (read_rom(device, generation, i, &rom[i]) != RCODE_COMPLETE) return -1; end = i + (rom[i] >> 16) + 1; i++; @@ -511,7 +519,8 @@ static int read_bus_info_block(struct fw_device *device) * it references another block, and push it in that case. */ while (i < end) { - if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE) + if (read_rom(device, generation, i, &rom[i]) != + RCODE_COMPLETE) return -1; if ((key >> 30) == 3 && (rom[i] >> 30) > 1 && sp < ARRAY_SIZE(stack)) @@ -658,7 +667,7 @@ static void fw_device_init(struct work_struct *work) * device. */ - if (read_bus_info_block(device) < 0) { + if (read_bus_info_block(device, device->generation) < 0) { if (device->config_rom_retries < MAX_RETRIES) { device->config_rom_retries++; schedule_delayed_work(&device->work, RETRY_DELAY); |