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Bluetooth: btusb: request wake pin with NOAUTOEN

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commit 771acc7e4a 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: fd913ef7ce ("Bluetooth: btusb: Add out-of-band wakeup support")
Fixes: 5364a0b4f4 ("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>
This commit is contained in:
Brian Norris 2019-04-09 11:49:17 -07:00 committed by Greg Kroah-Hartman
parent 3f8497cfff
commit f5ad05e680
1 changed files with 1 additions and 1 deletions
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2
drivers/bluetooth/btusb.c
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@ -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;
}