[PATCH AUTOSEL 4.19 42/53] Bluetooth: btusb: request wake pin with NOAUTOEN

Sasha Levin
2019-04-27T01:49:18Z

From: Brian Norris <briannorris@chromium.org>

[ Upstream commit 771acc7e4a6e5dba779cb1a7fd851a164bc81033 ]

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: Sasha Levin <sashal@kernel.org>
---
drivers/bluetooth/btusb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 77b67a5f21ee..40a4f95f6178 100644
--- 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;
}
--
2.19.1