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Bluetooth: Advertising entries lifetime

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This patch adds a timer to clear 'adv_entries' after three minutes.

After some amount of time, the advertising entries cached during
the last LE scan should be considered expired and they should be
removed from the advertising cache.

It was chosen a three minutes timeout as an initial attempt. This
value might change in future.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Andre Guedes 2011-05-26 16:23:53 -03:00 committed by Gustavo F. Padovan
parent eb9d91f5ae
commit 3581508571
3 changed files with 21 additions and 1 deletions
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2
include/net/bluetooth/hci_core.h
View File

@ -188,6 +188,7 @@ struct hci_dev {
struct list_head remote_oob_data;
struct list_head adv_entries;
struct timer_list adv_timer;
struct hci_dev_stats stat;
@ -535,6 +536,7 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
u8 *randomizer);
int hci_remove_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr);
#define ADV_CLEAR_TIMEOUT (3*60*HZ) /* Three minutes */
int hci_adv_entries_clear(struct hci_dev *hdev);
struct adv_entry *hci_find_adv_entry(struct hci_dev *hdev, bdaddr_t *bdaddr);
int hci_add_adv_entry(struct hci_dev *hdev,

14
net/bluetooth/hci_core.c
View File

@ -1202,6 +1202,17 @@ int hci_add_remote_oob_data(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 *hash,
return 0;
}
static void hci_clear_adv_cache(unsigned long arg)
{
struct hci_dev *hdev = (void *) arg;
hci_dev_lock(hdev);
hci_adv_entries_clear(hdev);
hci_dev_unlock(hdev);
}
int hci_adv_entries_clear(struct hci_dev *hdev)
{
struct adv_entry *entry, *tmp;
@ -1330,6 +1341,8 @@ int hci_register_dev(struct hci_dev *hdev)
INIT_LIST_HEAD(&hdev->remote_oob_data);
INIT_LIST_HEAD(&hdev->adv_entries);
setup_timer(&hdev->adv_timer, hci_clear_adv_cache,
(unsigned long) hdev);
INIT_WORK(&hdev->power_on, hci_power_on);
INIT_WORK(&hdev->power_off, hci_power_off);
@ -1403,6 +1416,7 @@ int hci_unregister_dev(struct hci_dev *hdev)
hci_unregister_sysfs(hdev);
hci_del_off_timer(hdev);
del_timer(&hdev->adv_timer);
destroy_workqueue(hdev->workqueue);

6
net/bluetooth/hci_event.c
View File

@ -856,8 +856,12 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
hci_dev_lock(hdev);
if (cp->enable == 0x01)
if (cp->enable == 0x01) {
del_timer(&hdev->adv_timer);
hci_adv_entries_clear(hdev);
} else if (cp->enable == 0x00) {
mod_timer(&hdev->adv_timer, jiffies + ADV_CLEAR_TIMEOUT);
}
hci_dev_unlock(hdev);
}