Date: Sat, 22 Jan 2011 15:05:03 +0100 From: Clemens Ladisch Subject: firewire: core: fix card->reset_jiffies overflow On a 32-bit machine with, e.g., HZ=1000, jiffies will overflow after about 50 days, so if there are between 25 and 50 days between bus resets, the card->reset_jiffies comparisons can get wrong results. To fix this, ensure that this timestamp always uses 64 bits. Signed-off-by: Clemens Ladisch Signed-off-by: "Stefan Richter" --- drivers/firewire/core-card.c | 5 +++-- drivers/firewire/core-cdev.c | 3 ++- drivers/firewire/core-device.c | 3 ++- drivers/firewire/core-topology.c | 2 +- include/linux/firewire.h | 2 +- 5 files changed, 9 insertions(+), 6 deletions(-) Index: b/include/linux/firewire.h =================================================================== --- a/include/linux/firewire.h +++ b/include/linux/firewire.h @@ -89,7 +89,7 @@ struct fw_card { int current_tlabel; u64 tlabel_mask; struct list_head transaction_list; - unsigned long reset_jiffies; + u64 reset_jiffies; u32 split_timeout_hi; u32 split_timeout_lo; Index: b/drivers/firewire/core-topology.c =================================================================== --- a/drivers/firewire/core-topology.c +++ b/drivers/firewire/core-topology.c @@ -545,7 +545,7 @@ void fw_core_handle_bus_reset(struct fw_ */ smp_wmb(); card->generation = generation; - card->reset_jiffies = jiffies; + card->reset_jiffies = get_jiffies_64(); card->bm_node_id = 0xffff; card->bm_abdicate = bm_abdicate; fw_schedule_bm_work(card, 0); Index: b/drivers/firewire/core-card.c =================================================================== --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -233,7 +233,7 @@ static void br_work(struct work_struct * /* Delay for 2s after last reset per IEEE 1394 clause 8.2.1. */ if (card->reset_jiffies != 0 && - time_is_after_jiffies(card->reset_jiffies + 2 * HZ)) { + time_before64(get_jiffies_64(), card->reset_jiffies + 2 * HZ)) { if (!schedule_delayed_work(&card->br_work, 2 * HZ)) fw_card_put(card); return; @@ -316,7 +316,8 @@ static void bm_work(struct work_struct * irm_id = card->irm_node->node_id; local_id = card->local_node->node_id; - grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8)); + grace = time_after64(get_jiffies_64(), + card->reset_jiffies + DIV_ROUND_UP(HZ, 8)); if ((is_next_generation(generation, card->bm_generation) && !card->bm_abdicate) || Index: b/drivers/firewire/core-cdev.c =================================================================== --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -1205,7 +1205,8 @@ static void iso_resource_work(struct wor todo = r->todo; /* Allow 1000ms grace period for other reallocations. */ if (todo == ISO_RES_ALLOC && - time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) { + time_before64(get_jiffies_64(), + client->device->card->reset_jiffies + HZ)) { schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3)); skip = true; } else { Index: b/drivers/firewire/core-device.c =================================================================== --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -747,7 +747,8 @@ static void fw_device_shutdown(struct wo container_of(work, struct fw_device, work.work); int minor = MINOR(device->device.devt); - if (time_is_after_jiffies(device->card->reset_jiffies + SHUTDOWN_DELAY) + if (time_before64(get_jiffies_64(), + device->card->reset_jiffies + SHUTDOWN_DELAY) && !list_empty(&device->card->link)) { schedule_delayed_work(&device->work, SHUTDOWN_DELAY); return;