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Miller" , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org During system suspend, advertisement monitoring is disabled by setting the=C2=A0HCI_VS_MSFT_LE_Set_Advertisement_Filter_Enable to False. This disables the monitoring during suspend, however, if the controller is monitoring a device, it sends HCI_VS_MSFT_LE_Monitor_Device_Event to indicate that the monitoring has been stopped for that particular device. This event may occur after suspend depending on the low_threshold_timeout and peer device advertisement frequency, which causes early wake up. Right way to disable the monitoring for suspend is by removing all the monitors before suspend and re-monitor after resume to ensure no events are received=C2=A0during suspend. This patch fixes this suspend/resume issu= e. Following tests are performed: - Add monitors before suspend and make sure DeviceFound gets triggered - Suspend the system and verify that all monitors are removed by kernel but not Released by bluetoothd - Wake up and verify that all monitors are added again and DeviceFound gets triggered Reviewed-by: apusaka@google.com Reviewed-by: mcchou@google.com Signed-off-by: Manish Mandlik --- net/bluetooth/hci_request.c | 15 +++-- net/bluetooth/msft.c | 117 +++++++++++++++++++++++++++++++----- net/bluetooth/msft.h | 5 ++ 3 files changed, 116 insertions(+), 21 deletions(-) diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c index 47fb665277d4..c018a172ced3 100644 --- a/net/bluetooth/hci_request.c +++ b/net/bluetooth/hci_request.c @@ -1281,21 +1281,24 @@ static void suspend_req_complete(struct hci_dev *hd= ev, u8 status, u16 opcode) } } =20 -static void hci_req_add_set_adv_filter_enable(struct hci_request *req, - bool enable) +static void hci_req_prepare_adv_monitor_suspend(struct hci_request *req, + bool suspending) { struct hci_dev *hdev =3D req->hdev; =20 switch (hci_get_adv_monitor_offload_ext(hdev)) { case HCI_ADV_MONITOR_EXT_MSFT: - msft_req_add_set_filter_enable(req, enable); + if (suspending) + msft_remove_all_monitors_on_suspend(hdev); + else + msft_reregister_monitors_on_resume(hdev); break; default: return; } =20 /* No need to block when enabling since it's on resume path */ - if (hdev->suspended && !enable) + if (hdev->suspended && suspending) set_bit(SUSPEND_SET_ADV_FILTER, hdev->suspend_tasks); } =20 @@ -1362,7 +1365,7 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, en= um suspended_state next) } =20 /* Disable advertisement filters */ - hci_req_add_set_adv_filter_enable(&req, false); + hci_req_prepare_adv_monitor_suspend(&req, true); =20 /* Prevent disconnects from causing scanning to be re-enabled */ hdev->scanning_paused =3D true; @@ -1404,7 +1407,7 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, en= um suspended_state next) /* Reset passive/background scanning to normal */ __hci_update_background_scan(&req); /* Enable all of the advertisement filters */ - hci_req_add_set_adv_filter_enable(&req, true); + hci_req_prepare_adv_monitor_suspend(&req, false); =20 /* Unpause directed advertising */ hdev->advertising_paused =3D false; diff --git a/net/bluetooth/msft.c b/net/bluetooth/msft.c index 21b1787e7893..328d5e341f9a 100644 --- a/net/bluetooth/msft.c +++ b/net/bluetooth/msft.c @@ -94,11 +94,14 @@ struct msft_data { __u16 pending_add_handle; __u16 pending_remove_handle; __u8 reregistering; + __u8 suspending; __u8 filter_enabled; }; =20 static int __msft_add_monitor_pattern(struct hci_dev *hdev, struct adv_monitor *monitor); +static int __msft_remove_monitor(struct hci_dev *hdev, + struct adv_monitor *monitor, u16 handle); =20 bool msft_monitor_supported(struct hci_dev *hdev) { @@ -154,7 +157,7 @@ static bool read_supported_features(struct hci_dev *hde= v, } =20 /* This function requires the caller holds hdev->lock */ -static void reregister_monitor_on_restart(struct hci_dev *hdev, int handle= ) +static void reregister_monitor(struct hci_dev *hdev, int handle) { struct adv_monitor *monitor; struct msft_data *msft =3D hdev->msft_data; @@ -182,6 +185,69 @@ static void reregister_monitor_on_restart(struct hci_d= ev *hdev, int handle) } } =20 +/* This function requires the caller holds hdev->lock */ +static void remove_monitor_on_suspend(struct hci_dev *hdev, int handle) +{ + struct adv_monitor *monitor; + struct msft_data *msft =3D hdev->msft_data; + int err; + + while (1) { + monitor =3D idr_get_next(&hdev->adv_monitors_idr, &handle); + if (!monitor) { + /* All monitors have been removed */ + msft->suspending =3D false; + hci_update_background_scan(hdev); + return; + } + + msft->pending_remove_handle =3D (u16)handle; + err =3D __msft_remove_monitor(hdev, monitor, handle); + + /* If success, return and wait for monitor removed callback */ + if (!err) + return; + + /* Otherwise free the monitor and keep removing */ + hci_free_adv_monitor(hdev, monitor); + handle++; + } +} + +/* This function requires the caller holds hdev->lock */ +void msft_remove_all_monitors_on_suspend(struct hci_dev *hdev) +{ + struct msft_data *msft =3D hdev->msft_data; + + if (!msft) + return; + + if (msft_monitor_supported(hdev)) { + msft->suspending =3D true; + /* Quitely remove all monitors on suspend to avoid waking up + * the system. + */ + remove_monitor_on_suspend(hdev, 0); + } +} + +/* This function requires the caller holds hdev->lock */ +void msft_reregister_monitors_on_resume(struct hci_dev *hdev) +{ + struct msft_data *msft =3D hdev->msft_data; + + if (!msft) + return; + + if (msft_monitor_supported(hdev)) { + msft->reregistering =3D true; + /* Monitors are removed on suspend, so we need to add all + * monitors on resume. + */ + reregister_monitor(hdev, 0); + } +} + void msft_do_open(struct hci_dev *hdev) { struct msft_data *msft =3D hdev->msft_data; @@ -214,7 +280,7 @@ void msft_do_open(struct hci_dev *hdev) /* Monitors get removed on power off, so we need to explicitly * tell the controller to re-monitor. */ - reregister_monitor_on_restart(hdev, 0); + reregister_monitor(hdev, 0); } } =20 @@ -382,8 +448,7 @@ static void msft_le_monitor_advertisement_cb(struct hci= _dev *hdev, =20 /* If in restart/reregister sequence, keep registering. */ if (msft->reregistering) - reregister_monitor_on_restart(hdev, - msft->pending_add_handle + 1); + reregister_monitor(hdev, msft->pending_add_handle + 1); =20 hci_dev_unlock(hdev); =20 @@ -420,13 +485,25 @@ static void msft_le_cancel_monitor_advertisement_cb(s= truct hci_dev *hdev, if (handle_data) { monitor =3D idr_find(&hdev->adv_monitors_idr, handle_data->mgmt_handle); - if (monitor) + + if (monitor && monitor->state =3D=3D ADV_MONITOR_STATE_OFFLOADED) + monitor->state =3D ADV_MONITOR_STATE_REGISTERED; + + /* Do not free the monitor if it is being removed due to + * suspend. It will be re-monitored on resume. + */ + if (monitor && !msft->suspending) hci_free_adv_monitor(hdev, monitor); =20 list_del(&handle_data->list); kfree(handle_data); } =20 + /* If in suspend/remove sequence, keep removing. */ + if (msft->suspending) + remove_monitor_on_suspend(hdev, + msft->pending_remove_handle + 1); + /* If remove all monitors is required, we need to continue the process * here because the earlier it was paused when waiting for the * response from controller. @@ -445,7 +522,8 @@ static void msft_le_cancel_monitor_advertisement_cb(str= uct hci_dev *hdev, hci_dev_unlock(hdev); =20 done: - hci_remove_adv_monitor_complete(hdev, status); + if (!msft->suspending) + hci_remove_adv_monitor_complete(hdev, status); } =20 static void msft_le_set_advertisement_filter_enable_cb(struct hci_dev *hde= v, @@ -578,15 +656,15 @@ int msft_add_monitor_pattern(struct hci_dev *hdev, st= ruct adv_monitor *monitor) if (!msft) return -EOPNOTSUPP; =20 - if (msft->reregistering) + if (msft->reregistering || msft->suspending) return -EBUSY; =20 return __msft_add_monitor_pattern(hdev, monitor); } =20 /* This function requires the caller holds hdev->lock */ -int msft_remove_monitor(struct hci_dev *hdev, struct adv_monitor *monitor, - u16 handle) +static int __msft_remove_monitor(struct hci_dev *hdev, + struct adv_monitor *monitor, u16 handle) { struct msft_cp_le_cancel_monitor_advertisement cp; struct msft_monitor_advertisement_handle_data *handle_data; @@ -594,12 +672,6 @@ int msft_remove_monitor(struct hci_dev *hdev, struct a= dv_monitor *monitor, struct msft_data *msft =3D hdev->msft_data; int err =3D 0; =20 - if (!msft) - return -EOPNOTSUPP; - - if (msft->reregistering) - return -EBUSY; - handle_data =3D msft_find_handle_data(hdev, monitor->handle, true); =20 /* If no matched handle, just remove without telling controller */ @@ -619,6 +691,21 @@ int msft_remove_monitor(struct hci_dev *hdev, struct a= dv_monitor *monitor, return err; } =20 +/* This function requires the caller holds hdev->lock */ +int msft_remove_monitor(struct hci_dev *hdev, struct adv_monitor *monitor, + u16 handle) +{ + struct msft_data *msft =3D hdev->msft_data; + + if (!msft) + return -EOPNOTSUPP; + + if (msft->reregistering || msft->suspending) + return -EBUSY; + + return __msft_remove_monitor(hdev, monitor, handle); +} + void msft_req_add_set_filter_enable(struct hci_request *req, bool enable) { struct hci_dev *hdev =3D req->hdev; diff --git a/net/bluetooth/msft.h b/net/bluetooth/msft.h index 8018948c5975..6ec843b94d16 100644 --- a/net/bluetooth/msft.h +++ b/net/bluetooth/msft.h @@ -24,6 +24,8 @@ int msft_remove_monitor(struct hci_dev *hdev, struct adv_= monitor *monitor, u16 handle); void msft_req_add_set_filter_enable(struct hci_request *req, bool enable); int msft_set_filter_enable(struct hci_dev *hdev, bool enable); +void msft_remove_all_monitors_on_suspend(struct hci_dev *hdev); +void msft_reregister_monitors_on_resume(struct hci_dev *hdev); bool msft_curve_validity(struct hci_dev *hdev); =20 #else @@ -59,6 +61,9 @@ static inline int msft_set_filter_enable(struct hci_dev *= hdev, bool enable) return -EOPNOTSUPP; } =20 +void msft_remove_all_monitors_on_suspend(struct hci_dev *hdev) {} +void msft_reregister_monitors_on_resume(struct hci_dev *hdev) {} + static inline bool msft_curve_validity(struct hci_dev *hdev) { return false; --=20 2.33.0.464.g1972c5931b-goog