linux-kernel - [PATCH 5.11 052/104] Bluetooth: Add new HCI_QUIRK_NO_SUSPEND

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Date:   Fri,  5 Mar 2021 13:20:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 052/104] Bluetooth: Add new HCI_QUIRK_NO_SUSPEND_NOTIFIER quirk

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit 219991e6be7f4a31d471611e265b72f75b2d0538 ]

Some devices, e.g. the RTL8723BS bluetooth part, some USB attached devices,
completely drop from the bus on a system-suspend. These devices will
have their driver unbound and rebound on resume (when the dropping of
the bus gets detected) and will show up as a new HCI after resume.

These devices do not benefit from the suspend / resume handling work done
by the hci_suspend_notifier. At best this unnecessarily adds some time to
the suspend/resume time. But this may also actually cause problems, if the
code doing the driver unbinding runs after the pm-notifier then the
hci_suspend_notifier code will try to talk to a device which is now in
an uninitialized state.

This commit adds a new HCI_QUIRK_NO_SUSPEND_NOTIFIER quirk which allows
drivers to opt-out of the hci_suspend_notifier when they know beforehand
that their device will be fully re-initialized / reprobed on resume.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/net/bluetooth/hci.h |  8 ++++++++
 net/bluetooth/hci_core.c    | 18 +++++++++++-------
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index c1504aa3d9cf..ba2f439bc04d 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -238,6 +238,14 @@ enum {
 	 * during the hdev->setup vendor callback.
 	 */
 	HCI_QUIRK_BROKEN_ERR_DATA_REPORTING,
+
+	/*
+	 * When this quirk is set, then the hci_suspend_notifier is not
+	 * registered. This is intended for devices which drop completely
+	 * from the bus on system-suspend and which will show up as a new
+	 * HCI after resume.
+	 */
+	HCI_QUIRK_NO_SUSPEND_NOTIFIER,
 };
 
 /* HCI device flags */
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index ed3380db0217..6ea2e16c57bd 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3830,10 +3830,12 @@ int hci_register_dev(struct hci_dev *hdev)
 	hci_sock_dev_event(hdev, HCI_DEV_REG);
 	hci_dev_hold(hdev);
 
-	hdev->suspend_notifier.notifier_call = hci_suspend_notifier;
-	error = register_pm_notifier(&hdev->suspend_notifier);
-	if (error)
-		goto err_wqueue;
+	if (!test_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks)) {
+		hdev->suspend_notifier.notifier_call = hci_suspend_notifier;
+		error = register_pm_notifier(&hdev->suspend_notifier);
+		if (error)
+			goto err_wqueue;
+	}
 
 	queue_work(hdev->req_workqueue, &hdev->power_on);
 
@@ -3868,9 +3870,11 @@ void hci_unregister_dev(struct hci_dev *hdev)
 
 	cancel_work_sync(&hdev->power_on);
 
-	hci_suspend_clear_tasks(hdev);
-	unregister_pm_notifier(&hdev->suspend_notifier);
-	cancel_work_sync(&hdev->suspend_prepare);
+	if (!test_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks)) {
+		hci_suspend_clear_tasks(hdev);
+		unregister_pm_notifier(&hdev->suspend_notifier);
+		cancel_work_sync(&hdev->suspend_prepare);
+	}
 
 	hci_dev_do_close(hdev);
 
-- 
2.30.1