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| author | Clemens Ladisch <clemens@ladisch.de> | 2011-01-22 15:05:03 +0100 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2011-01-23 12:31:01 +0100 |
| commit | e71084af58cf15e6043338500eeaf6281d0a62af (patch) | |
| tree | d757d4891a4f93f7a07c1f12448d3be3be748fa1 | |
| parent | dbc9880fa731fe2482a706bbabb4165269233063 (diff) | |
| download | linux-e71084af58cf15e6043338500eeaf6281d0a62af.tar.gz linux-e71084af58cf15e6043338500eeaf6281d0a62af.tar.bz2 linux-e71084af58cf15e6043338500eeaf6281d0a62af.zip | |
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 <clemens@ladisch.de>
Signed-off-by: "Stefan Richter" <stefanr@s5r6.in-berlin.de>
| -rw-r--r-- | drivers/firewire/core-card.c | 5 | ||||
| -rw-r--r-- | drivers/firewire/core-cdev.c | 3 | ||||
| -rw-r--r-- | drivers/firewire/core-device.c | 3 | ||||
| -rw-r--r-- | drivers/firewire/core-topology.c | 2 | ||||
| -rw-r--r-- | include/linux/firewire.h | 2 |
5 files changed, 9 insertions, 6 deletions
diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index 24ff35511e2b..3241dc4e1fc9 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -233,7 +233,7 @@ static void br_work(struct work_struct *work) /* 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 *work) 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) || diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index e0c13fb3ae22..62ac111af243 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -1205,7 +1205,8 @@ static void iso_resource_work(struct work_struct *work) 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 { diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c index 6113b896e790..57461923bacf 100644 --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -747,7 +747,8 @@ static void fw_device_shutdown(struct work_struct *work) 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; diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c index 09be1a635505..193ed9233144 100644 --- a/drivers/firewire/core-topology.c +++ b/drivers/firewire/core-topology.c @@ -545,7 +545,7 @@ 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->reset_jiffies = get_jiffies_64(); card->bm_node_id = 0xffff; card->bm_abdicate = bm_abdicate; fw_schedule_bm_work(card, 0); diff --git a/include/linux/firewire.h b/include/linux/firewire.h index 9a3f5f9383f6..b6d21d5a11a2 100644 --- 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; |