This is a note to let you know that I've just added the patch titled

Bluetooth: btusb: driver to enable the usb-wakeup feature

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: bluetooth-btusb-driver-to-enable-the-usb-wakeup-feature.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From a0085f2510e8976614ad8f766b209448b385492f Mon Sep 17 00:00:00 2001

From: Sukumar Ghorai sukumar.ghorai@intel.com Date: Wed, 16 Aug 2017 14:46:55 -0700 Subject: Bluetooth: btusb: driver to enable the usb-wakeup feature

From: Sukumar Ghorai sukumar.ghorai@intel.com

commit a0085f2510e8976614ad8f766b209448b385492f upstream.

BT-Controller connected as platform non-root-hub device and usb-driver initialize such device with wakeup disabled, Ref. usb_new_device().

At present wakeup-capability get enabled by hid-input device from usb function driver(e.g. BT HID device) at runtime. Again some functional driver does not set usb-wakeup capability(e.g LE HID device implement as HID-over-GATT), and can't wakeup the host on USB.

Most of the device operation (such as mass storage) initiated from host (except HID) and USB wakeup aligned with host resume procedure. For BT device, usb-wakeup capability need to enable form btusc driver as a generic solution for multiple profile use case and required for USB remote wakeup (in-bus wakeup) while host is suspended. Also usb-wakeup feature need to enable/disable with HCI interface up and down.

Signed-off-by: Sukumar Ghorai sukumar.ghorai@intel.com Signed-off-by: Amit K Bag amit.k.bag@intel.com Acked-by: Oliver Neukum oneukum@suse.com Signed-off-by: Marcel Holtmann marcel@holtmann.org Cc: Matthias Kaehlcke mka@chromium.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/bluetooth/btusb.c | 5 +++++ 1 file changed, 5 insertions(+)

--- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -1059,6 +1059,10 @@ static int btusb_open(struct hci_dev *hd }

data->intf->needs_remote_wakeup = 1; + /* device specific wakeup source enabled and required for USB + * remote wakeup while host is suspended + */ + device_wakeup_enable(&data->udev->dev);

if (test_and_set_bit(BTUSB_INTR_RUNNING, &data->flags)) goto done; @@ -1122,6 +1126,7 @@ static int btusb_close(struct hci_dev *h goto failed;

data->intf->needs_remote_wakeup = 0; + device_wakeup_disable(&data->udev->dev); usb_autopm_put_interface(data->intf);

failed:

Patches currently in stable-queue which might be from sukumar.ghorai@intel.com are

queue-4.9/bluetooth-btusb-driver-to-enable-the-usb-wakeup-feature.patch