This is a note to let you know that I've just added the patch titled
Bluetooth: btusb: Don't fail external suspend requests
to the 6.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-btusb-don-t-fail-external-suspend-requests.patch
and it can be found in the queue-6.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9dd4f4626495f9f03387ac0a6b0e82d49761134c
Author: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Date: Tue Oct 1 11:21:37 2024 -0400
Bluetooth: btusb: Don't fail external suspend requests
[ Upstream commit 610712298b11b2914be00b35abe9326b5dbb62c8 ]
Commit 4e0a1d8b0675
("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: 4e0a1d8b0675 ("Bluetooth: btusb: Don't suspend when there are connections")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Tested-by: Kiran K <kiran.k@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 93dbeb8b348d5..a1e9b052bc847 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -4092,16 +4092,29 @@ 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);
@@ -4109,6 +4122,7 @@ 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;
}
@@ -4229,6 +4243,8 @@ 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:
