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SubjectRe: [PATCH 2/2] Bluetooth: btusb: Disable LE Advertising on system suspend
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Hi Kai-Heng,

> System may freeze during suspend, and it's caused by btusb early wakeup:
>
> kernel: pci_pm_suspend(): hcd_pci_suspend+0x0/0x30 returns -16
> kernel: dpm_run_callback(): pci_pm_suspend+0x0/0x130 returns -16
> kernel: PM: Device 0000:00:14.0 failed to suspend async: error -16
> kernel: PM: Some devices failed to suspend, or early wake event detected
> kernel: usb usb1: usb resume
> kernel: hub 1-0:1.0: hub_resume
> kernel: usb usb1-port1: status 0507 change 0000
> kernel: usb usb1-port6: status 0103 change 0004
> kernel: usb usb1-port10: status 0107 change 0000
>
> where btusb is connecte to usb1-port6.
>
> The expirement shows that the early wakeup is caused by LE Advertising
> packet.
>
> Disabling it via event mask can prevent the issue from happening.
>
> BugLink: https://bugs.launchpad.net/bugs/1823029
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> drivers/bluetooth/btusb.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 10c8f9872ee5..f03fcf5687e4 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -490,6 +490,7 @@ struct btusb_data {
> int (*setup_on_usb)(struct hci_dev *hdev);
>
> int oob_wake_irq; /* irq for out-of-band wake-on-bt */
> + bool suspended;
> };
>
> static inline void btusb_free_frags(struct btusb_data *data)
> @@ -3316,12 +3317,18 @@ static void btusb_disconnect(struct usb_interface *intf)
> static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
> {
> struct btusb_data *data = usb_get_intfdata(intf);
> + struct hci_dev *hdev = data->hdev;
>
> BT_DBG("intf %p", intf);
>
> if (data->suspend_count++)
> return 0;
>
> + if (!PMSG_IS_AUTO(message)) {
> + hci_disable_le_advertising(hdev);
> + data->suspended = true;
> + }
> +
> spin_lock_irq(&data->txlock);
> if (!(PMSG_IS_AUTO(message) && data->tx_in_flight)) {
> set_bit(BTUSB_SUSPENDING, &data->flags);
> @@ -3427,6 +3434,11 @@ static int btusb_resume(struct usb_interface *intf)
> spin_unlock_irq(&data->txlock);
> schedule_work(&data->work);
>
> + if (data->suspended) {
> + hci_enable_le_advertising(hdev);
> + data->suspended = false;
> + }
> +
> return 0;

this is a clear NAK. Please stop hacking things.

Lets use hci_suspend_dev and hci_resume_dev and make it actually do something to disable the events for advertising.

Regards

Marcel

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