diff options
author | Abhishek Pandit-Subedi <abhishekpandit@chromium.org> | 2020-03-11 08:54:00 -0700 |
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committer | Marcel Holtmann <marcel@holtmann.org> | 2020-03-11 18:00:48 +0100 |
commit | 9952d90ea2885d7cbf80cd233f694f09a9c0eaec (patch) | |
tree | 9b954ac288ac5dbcc782127c2b964012034fd2f6 /net/bluetooth/hci_core.c | |
parent | 72da7b2ccabd5fd93d6b8d0093936e980602652b (diff) | |
download | linux-9952d90ea2885d7cbf80cd233f694f09a9c0eaec.tar.bz2 |
Bluetooth: Handle PM_SUSPEND_PREPARE and PM_POST_SUSPEND
Register for PM_SUSPEND_PREPARE and PM_POST_SUSPEND to make sure the
Bluetooth controller is prepared correctly for suspend/resume. Implement
the registration, scheduling and task handling portions only in this
patch.
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/hci_core.c')
-rw-r--r-- | net/bluetooth/hci_core.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 196edc039b8e..39aa21a1fe92 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -31,6 +31,8 @@ #include <linux/debugfs.h> #include <linux/crypto.h> #include <linux/property.h> +#include <linux/suspend.h> +#include <linux/wait.h> #include <asm/unaligned.h> #include <net/bluetooth/bluetooth.h> @@ -1787,6 +1789,9 @@ int hci_dev_do_close(struct hci_dev *hdev) clear_bit(HCI_RUNNING, &hdev->flags); hci_sock_dev_event(hdev, HCI_DEV_CLOSE); + if (test_and_clear_bit(SUSPEND_POWERING_DOWN, hdev->suspend_tasks)) + wake_up(&hdev->suspend_wait_q); + /* After this point our queues are empty * and no tasks are scheduled. */ hdev->close(hdev); @@ -3264,6 +3269,78 @@ void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr, } } +static int hci_suspend_wait_event(struct hci_dev *hdev) +{ +#define WAKE_COND \ + (find_first_bit(hdev->suspend_tasks, __SUSPEND_NUM_TASKS) == \ + __SUSPEND_NUM_TASKS) + + int i; + int ret = wait_event_timeout(hdev->suspend_wait_q, + WAKE_COND, SUSPEND_NOTIFIER_TIMEOUT); + + if (ret == 0) { + bt_dev_dbg(hdev, "Timed out waiting for suspend"); + for (i = 0; i < __SUSPEND_NUM_TASKS; ++i) { + if (test_bit(i, hdev->suspend_tasks)) + bt_dev_dbg(hdev, "Bit %d is set", i); + clear_bit(i, hdev->suspend_tasks); + } + + ret = -ETIMEDOUT; + } else { + ret = 0; + } + + return ret; +} + +static void hci_prepare_suspend(struct work_struct *work) +{ + struct hci_dev *hdev = + container_of(work, struct hci_dev, suspend_prepare); + + hci_dev_lock(hdev); + hci_req_prepare_suspend(hdev, hdev->suspend_state_next); + hci_dev_unlock(hdev); +} + +static int hci_suspend_notifier(struct notifier_block *nb, unsigned long action, + void *data) +{ + struct hci_dev *hdev = + container_of(nb, struct hci_dev, suspend_notifier); + int ret = 0; + + /* If powering down, wait for completion. */ + if (mgmt_powering_down(hdev)) { + set_bit(SUSPEND_POWERING_DOWN, hdev->suspend_tasks); + ret = hci_suspend_wait_event(hdev); + if (ret) + goto done; + } + + /* Suspend notifier should only act on events when powered. */ + if (!hdev_is_powered(hdev)) + goto done; + + if (action == PM_SUSPEND_PREPARE) { + hdev->suspend_state_next = BT_SUSPENDED; + set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); + queue_work(hdev->req_workqueue, &hdev->suspend_prepare); + + ret = hci_suspend_wait_event(hdev); + } else if (action == PM_POST_SUSPEND) { + hdev->suspend_state_next = BT_RUNNING; + set_bit(SUSPEND_PREPARE_NOTIFIER, hdev->suspend_tasks); + queue_work(hdev->req_workqueue, &hdev->suspend_prepare); + + ret = hci_suspend_wait_event(hdev); + } + +done: + return ret ? notifier_from_errno(-EBUSY) : NOTIFY_STOP; +} /* Alloc HCI device */ struct hci_dev *hci_alloc_dev(void) { @@ -3341,6 +3418,7 @@ struct hci_dev *hci_alloc_dev(void) INIT_WORK(&hdev->tx_work, hci_tx_work); INIT_WORK(&hdev->power_on, hci_power_on); INIT_WORK(&hdev->error_reset, hci_error_reset); + INIT_WORK(&hdev->suspend_prepare, hci_prepare_suspend); INIT_DELAYED_WORK(&hdev->power_off, hci_power_off); @@ -3349,6 +3427,7 @@ struct hci_dev *hci_alloc_dev(void) skb_queue_head_init(&hdev->raw_q); init_waitqueue_head(&hdev->req_wait_q); + init_waitqueue_head(&hdev->suspend_wait_q); INIT_DELAYED_WORK(&hdev->cmd_timer, hci_cmd_timeout); @@ -3460,6 +3539,11 @@ int hci_register_dev(struct hci_dev *hdev) hci_sock_dev_event(hdev, HCI_DEV_REG); hci_dev_hold(hdev); + hdev->suspend_notifier.notifier_call = hci_suspend_notifier; + error = register_pm_notifier(&hdev->suspend_notifier); + if (error) + goto err_wqueue; + queue_work(hdev->req_workqueue, &hdev->power_on); return id; @@ -3493,6 +3577,8 @@ void hci_unregister_dev(struct hci_dev *hdev) hci_dev_do_close(hdev); + unregister_pm_notifier(&hdev->suspend_notifier); + if (!test_bit(HCI_INIT, &hdev->flags) && !hci_dev_test_flag(hdev, HCI_SETUP) && !hci_dev_test_flag(hdev, HCI_CONFIG)) { |