linux-kernel - [PATCH 3/3] Bluetooth: btusb: Implement hdev->prevent

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Date:   Tue, 12 May 2020 19:19:27 -0700
From:   Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
To:     marcel@...tmann.org, linux-bluetooth@...r.kernel.org
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Alain Michaud <alainm@...omium.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] Bluetooth: btusb: Implement hdev->prevent_wake

Implement the prevent_wake hook by checking device_may_wakeup on the usb
interface. This prevents the Bluetooth core from enabling scanning when
the device isn't expected to wake from suspend.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Reviewed-by: Alain Michaud <alainm@...omium.org>
---

 drivers/bluetooth/btusb.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 8ae3ad7a60131..c17359c0e3201 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3698,6 +3698,13 @@ static void btusb_check_needs_reset_resume(struct usb_interface *intf)
 		interface_to_usbdev(intf)->quirks |= USB_QUIRK_RESET_RESUME;
 }
 
+static bool btusb_prevent_wake(struct hci_dev *hdev)
+{
+	struct btusb_data *data = hci_get_drvdata(hdev);
+
+	return !device_may_wakeup(&data->udev->dev);
+}
+
 static int btusb_probe(struct usb_interface *intf,
 		       const struct usb_device_id *id)
 {
@@ -3831,6 +3838,7 @@ static int btusb_probe(struct usb_interface *intf,
 	hdev->flush  = btusb_flush;
 	hdev->send   = btusb_send_frame;
 	hdev->notify = btusb_notify;
+	hdev->prevent_wake = btusb_prevent_wake;
 
 #ifdef CONFIG_PM
 	err = btusb_config_oob_wake(hdev);
-- 
2.26.2.645.ge9eca65c58-goog