Bluetooth: btusb: request wake pin with NOAUTOEN

commit 771acc7e4a6e5dba779cb1a7fd851a164bc81033 upstream.

Badly-designed systems might have (for example) active-high wake pins
that default to high (e.g., because of external pull ups) until they
have an active firmware which starts driving it low.  This can cause an
interrupt storm in the time between request_irq() and disable_irq().

We don't support shared interrupts here, so let's just pre-configure the
interrupt to avoid auto-enabling it.

Fixes: fd913ef7ce61 ("Bluetooth: btusb: Add out-of-band wakeup support")
Fixes: 5364a0b4f4be ("arm64: dts: rockchip: move QCA6174A wakeup pin into its USB node")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 77b67a5f21eef58e8e771fc23fe5416a7cf3867c..40a4f95f6178158a3212fd7424c1813ef13a2aba 100644 (file)
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2888,6 +2888,7 @@ static int btusb_config_oob_wake(struct hci_dev *hdev)
                return 0;
        }
 
+       irq_set_status_flags(irq, IRQ_NOAUTOEN);
        ret = devm_request_irq(&hdev->dev, irq, btusb_oob_wake_handler,
                               0, "OOB Wake-on-BT", data);
        if (ret) {
@@ -2902,7 +2903,6 @@ static int btusb_config_oob_wake(struct hci_dev *hdev)
        }
 
        data->oob_wake_irq = irq;
-       disable_irq(irq);
        bt_dev_info(hdev, "OOB Wake-on-BT configured at IRQ %u", irq);
        return 0;
 }