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Bluetooth: btusb: Don't fail external suspend requests

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Commit 4e0a1d8b06
("Bluetooth: btusb: Don't suspend when there are connections")
introduces a check for connections to prevent auto-suspend but that
actually ignored the fact the .suspend callback can be called for
external suspend requests which
Documentation/driver-api/usb/power-management.rst states the following:

 'External suspend calls should never be allowed to fail in this way,
 only autosuspend calls.  The driver can tell them apart by applying
 the :c:func:`PMSG_IS_AUTO` macro to the message argument to the
 ``suspend`` method; it will return True for internal PM events
 (autosuspend) and False for external PM events.'

In addition to that align system suspend with USB suspend by using
hci_suspend_dev since otherwise the stack would be expecting events
such as advertising reports which may not be delivered while the
transport is suspended.

Fixes: 4e0a1d8b06 ("Bluetooth: btusb: Don't suspend when there are connections")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Tested-by: Kiran K <kiran.k@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2024-10-01 11:21:37 -04:00
parent 18fd04ad85
commit 610712298b
1 changed files with 18 additions and 2 deletions
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20
drivers/bluetooth/btusb.c
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@ -4038,16 +4038,29 @@ 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);
int err;
BT_DBG("intf %p", intf);
/* Don't suspend if there are connections */
if (hci_conn_count(data->hdev))
/* Don't auto-suspend if there are connections; external suspend calls
* shall never fail.
*/
if (PMSG_IS_AUTO(message) && hci_conn_count(data->hdev))
return -EBUSY;
if (data->suspend_count++)
return 0;
/* Notify Host stack to suspend; this has to be done before stopping
* the traffic since the hci_suspend_dev itself may generate some
* traffic.
*/
err = hci_suspend_dev(data->hdev);
if (err) {
data->suspend_count--;
return err;
}
spin_lock_irq(&data->txlock);
if (!(PMSG_IS_AUTO(message) && data->tx_in_flight)) {
set_bit(BTUSB_SUSPENDING, &data->flags);
@ -4055,6 +4068,7 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
} else {
spin_unlock_irq(&data->txlock);
data->suspend_count--;
hci_resume_dev(data->hdev);
return -EBUSY;
}
@ -4175,6 +4189,8 @@ static int btusb_resume(struct usb_interface *intf)
spin_unlock_irq(&data->txlock);
schedule_work(&data->work);
hci_resume_dev(data->hdev);
return 0;
failed: