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Bluetooth: Perform HCI update for power on synchronously 

The request to update HCI during power on is always coming either from
hdev->req_workqueue or through an ioctl, so it's safe to use
hci_req_sync for it. This way we also eliminate potential races with
incoming mgmt commands or other actions while powering on.

Part of this refactoring is the splitting of mgmt_powered() into
mgmt_power_on() and __mgmt_power_off() functions. The main reason is
the different requirements as far as hdev locking is concerned, as
highlighted with the __ prefix of the power off API.

Since the power on in the case of clearing the AUTO_OFF flag cannot be
done synchronously in the set_powered mgmt handler, the hci_power_on
work callback is extended to cover this (which also simplifies the
set_powered helper a lot).

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2015-11-25 16:15:44 +02:00 committed by Marcel Holtmann
parent bf943cbf76
commit 2ff13894cf
5 changed files with 129 additions and 135 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/bluetooth/hci_core.h
View File

@ -1435,7 +1435,8 @@ int mgmt_new_settings(struct hci_dev *hdev);
void mgmt_index_added(struct hci_dev *hdev);
void mgmt_index_removed(struct hci_dev *hdev);
void mgmt_set_powered_failed(struct hci_dev *hdev, int err);
int mgmt_powered(struct hci_dev *hdev, u8 powered);
void mgmt_power_on(struct hci_dev *hdev, int err);
void __mgmt_power_off(struct hci_dev *hdev);
void mgmt_new_link_key(struct hci_dev *hdev, struct link_key *key,
bool persistent);
void mgmt_device_connected(struct hci_dev *hdev, struct hci_conn *conn,

21
net/bluetooth/hci_core.c
View File

@ -1399,10 +1399,10 @@ static int hci_dev_do_open(struct hci_dev *hdev)
!hci_dev_test_flag(hdev, HCI_CONFIG) &&
!hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
!hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
hci_dev_test_flag(hdev, HCI_MGMT) &&
hdev->dev_type == HCI_BREDR) {
hci_dev_lock(hdev);
mgmt_powered(hdev, 1);
hci_dev_unlock(hdev);
ret = __hci_req_hci_power_on(hdev);
mgmt_power_on(hdev, ret);
}
} else {
/* Init failed, cleanup */
@ -1559,8 +1559,9 @@ int hci_dev_do_close(struct hci_dev *hdev)
auto_off = hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF);
if (!auto_off && hdev->dev_type == HCI_BREDR)
mgmt_powered(hdev, 0);
if (!auto_off && hdev->dev_type == HCI_BREDR &&
hci_dev_test_flag(hdev, HCI_MGMT))
__mgmt_power_off(hdev);
hci_inquiry_cache_flush(hdev);
hci_pend_le_actions_clear(hdev);
@ -2013,6 +2014,16 @@ static void hci_power_on(struct work_struct *work)
BT_DBG("%s", hdev->name);
if (test_bit(HCI_UP, &hdev->flags) &&
hci_dev_test_flag(hdev, HCI_MGMT) &&
hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF)) {
hci_req_sync_lock(hdev);
err = __hci_req_hci_power_on(hdev);
hci_req_sync_unlock(hdev);
mgmt_power_on(hdev, err);
return;
}
err = hci_dev_do_open(hdev);
if (err < 0) {
hci_dev_lock(hdev);

100
net/bluetooth/hci_request.c
View File

@ -2181,6 +2181,106 @@ static void discov_off(struct work_struct *work)
mgmt_new_settings(hdev);
}
static int powered_update_hci(struct hci_request *req, unsigned long opt)
{
struct hci_dev *hdev = req->hdev;
struct adv_info *adv_instance;
u8 link_sec;
hci_dev_lock(hdev);
if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED) &&
!lmp_host_ssp_capable(hdev)) {
u8 mode = 0x01;
hci_req_add(req, HCI_OP_WRITE_SSP_MODE, sizeof(mode), &mode);
if (bredr_sc_enabled(hdev) && !lmp_host_sc_capable(hdev)) {
u8 support = 0x01;
hci_req_add(req, HCI_OP_WRITE_SC_SUPPORT,
sizeof(support), &support);
}
}
if (hci_dev_test_flag(hdev, HCI_LE_ENABLED) &&
lmp_bredr_capable(hdev)) {
struct hci_cp_write_le_host_supported cp;
cp.le = 0x01;
cp.simul = 0x00;
/* Check first if we already have the right
* host state (host features set)
*/
if (cp.le != lmp_host_le_capable(hdev) ||
cp.simul != lmp_host_le_br_capable(hdev))
hci_req_add(req, HCI_OP_WRITE_LE_HOST_SUPPORTED,
sizeof(cp), &cp);
}
if (lmp_le_capable(hdev)) {
/* Make sure the controller has a good default for
* advertising data. This also applies to the case
* where BR/EDR was toggled during the AUTO_OFF phase.
*/
if (hci_dev_test_flag(hdev, HCI_LE_ENABLED) &&
(hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
!hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE))) {
__hci_req_update_adv_data(req, HCI_ADV_CURRENT);
__hci_req_update_scan_rsp_data(req, HCI_ADV_CURRENT);
}
if (hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE) &&
hdev->cur_adv_instance == 0x00 &&
!list_empty(&hdev->adv_instances)) {
adv_instance = list_first_entry(&hdev->adv_instances,
struct adv_info, list);
hdev->cur_adv_instance = adv_instance->instance;
}
if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
__hci_req_enable_advertising(req);
else if (hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE) &&
hdev->cur_adv_instance)
__hci_req_schedule_adv_instance(req,
hdev->cur_adv_instance,
true);
}
link_sec = hci_dev_test_flag(hdev, HCI_LINK_SECURITY);
if (link_sec != test_bit(HCI_AUTH, &hdev->flags))
hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE,
sizeof(link_sec), &link_sec);
if (lmp_bredr_capable(hdev)) {
if (hci_dev_test_flag(hdev, HCI_FAST_CONNECTABLE))
__hci_req_write_fast_connectable(req, true);
else
__hci_req_write_fast_connectable(req, false);
__hci_req_update_scan(req);
__hci_req_update_class(req);
__hci_req_update_name(req);
__hci_req_update_eir(req);
}
hci_dev_unlock(hdev);
return 0;
}
int __hci_req_hci_power_on(struct hci_dev *hdev)
{
/* Register the available SMP channels (BR/EDR and LE) only when
* successfully powering on the controller. This late
* registration is required so that LE SMP can clearly decide if
* the public address or static address is used.
*/
smp_register(hdev);
return __hci_req_sync(hdev, powered_update_hci, 0, HCI_CMD_TIMEOUT,
NULL);
}
void hci_request_setup(struct hci_dev *hdev)
{
INIT_WORK(&hdev->discov_update, discov_update);

2
net/bluetooth/hci_request.h
View File

@ -55,6 +55,8 @@ void hci_req_sync_cancel(struct hci_dev *hdev, int err);
struct sk_buff *hci_prepare_cmd(struct hci_dev *hdev, u16 opcode, u32 plen,
const void *param);
int __hci_req_hci_power_on(struct hci_dev *hdev);
void __hci_req_write_fast_connectable(struct hci_request *req, bool enable);
void __hci_req_update_name(struct hci_request *req);
void __hci_req_update_eir(struct hci_request *req);

138
net/bluetooth/mgmt.c
View File

@ -961,17 +961,6 @@ static int set_powered(struct sock *sk, struct hci_dev *hdev, void *data,
goto failed;
}
if (hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF)) {
cancel_delayed_work(&hdev->power_off);
if (cp->val) {
mgmt_pending_add(sk, MGMT_OP_SET_POWERED, hdev,
data, len);
err = mgmt_powered(hdev, 1);
goto failed;
}
}
if (!!cp->val == hdev_is_powered(hdev)) {
err = send_settings_rsp(sk, MGMT_OP_SET_POWERED, hdev);
goto failed;
@ -6434,139 +6423,33 @@ static void restart_le_actions(struct hci_dev *hdev)
}
}
static void powered_complete(struct hci_dev *hdev, u8 status, u16 opcode)
void mgmt_power_on(struct hci_dev *hdev, int err)
{
struct cmd_lookup match = { NULL, hdev };
BT_DBG("status 0x%02x", status);
BT_DBG("err %d", err);
if (!status) {
hci_dev_lock(hdev);
if (!err) {
restart_le_actions(hdev);
hci_update_background_scan(hdev);
}
hci_dev_lock(hdev);
mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
new_settings(hdev, match.sk);
hci_dev_unlock(hdev);
if (match.sk)
sock_put(match.sk);
hci_dev_unlock(hdev);
}
static int powered_update_hci(struct hci_dev *hdev)
{
struct hci_request req;
struct adv_info *adv_instance;
u8 link_sec;
hci_req_init(&req, hdev);
if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED) &&
!lmp_host_ssp_capable(hdev)) {
u8 mode = 0x01;
hci_req_add(&req, HCI_OP_WRITE_SSP_MODE, sizeof(mode), &mode);
if (bredr_sc_enabled(hdev) && !lmp_host_sc_capable(hdev)) {
u8 support = 0x01;
hci_req_add(&req, HCI_OP_WRITE_SC_SUPPORT,
sizeof(support), &support);
}
}
if (hci_dev_test_flag(hdev, HCI_LE_ENABLED) &&
lmp_bredr_capable(hdev)) {
struct hci_cp_write_le_host_supported cp;
cp.le = 0x01;
cp.simul = 0x00;
/* Check first if we already have the right
* host state (host features set)
*/
if (cp.le != lmp_host_le_capable(hdev) ||
cp.simul != lmp_host_le_br_capable(hdev))
hci_req_add(&req, HCI_OP_WRITE_LE_HOST_SUPPORTED,
sizeof(cp), &cp);
}
if (lmp_le_capable(hdev)) {
/* Make sure the controller has a good default for
* advertising data. This also applies to the case
* where BR/EDR was toggled during the AUTO_OFF phase.
*/
if (hci_dev_test_flag(hdev, HCI_LE_ENABLED) &&
(hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
!hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE))) {
__hci_req_update_adv_data(&req, HCI_ADV_CURRENT);
__hci_req_update_scan_rsp_data(&req, HCI_ADV_CURRENT);
}
if (hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE) &&
hdev->cur_adv_instance == 0x00 &&
!list_empty(&hdev->adv_instances)) {
adv_instance = list_first_entry(&hdev->adv_instances,
struct adv_info, list);
hdev->cur_adv_instance = adv_instance->instance;
}
if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
__hci_req_enable_advertising(&req);
else if (hci_dev_test_flag(hdev, HCI_ADVERTISING_INSTANCE) &&
hdev->cur_adv_instance)
__hci_req_schedule_adv_instance(&req,
hdev->cur_adv_instance,
true);
}
link_sec = hci_dev_test_flag(hdev, HCI_LINK_SECURITY);
if (link_sec != test_bit(HCI_AUTH, &hdev->flags))
hci_req_add(&req, HCI_OP_WRITE_AUTH_ENABLE,
sizeof(link_sec), &link_sec);
if (lmp_bredr_capable(hdev)) {
if (hci_dev_test_flag(hdev, HCI_FAST_CONNECTABLE))
__hci_req_write_fast_connectable(&req, true);
else
__hci_req_write_fast_connectable(&req, false);
__hci_req_update_scan(&req);
__hci_req_update_class(&req);
__hci_req_update_name(&req);
__hci_req_update_eir(&req);
}
return hci_req_run(&req, powered_complete);
}
int mgmt_powered(struct hci_dev *hdev, u8 powered)
void __mgmt_power_off(struct hci_dev *hdev)
{
struct cmd_lookup match = { NULL, hdev };
u8 status, zero_cod[] = { 0, 0, 0 };
int err;
if (!hci_dev_test_flag(hdev, HCI_MGMT))
return 0;
if (powered) {
/* Register the available SMP channels (BR/EDR and LE) only
* when successfully powering on the controller. This late
* registration is required so that LE SMP can clearly
* decide if the public address or static address is used.
*/
smp_register(hdev);
if (powered_update_hci(hdev) == 0)
return 0;
mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp,
&match);
goto new_settings;
}
mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
@ -6588,13 +6471,10 @@ int mgmt_powered(struct hci_dev *hdev, u8 powered)
mgmt_generic_event(MGMT_EV_CLASS_OF_DEV_CHANGED, hdev,
zero_cod, sizeof(zero_cod), NULL);
new_settings:
err = new_settings(hdev, match.sk);
new_settings(hdev, match.sk);
if (match.sk)
sock_put(match.sk);
return err;
}
void mgmt_set_powered_failed(struct hci_dev *hdev, int err)