linux-kernel - [PATCH 5.9 224/757] Bluetooth: Clear suspend tasks on unregister

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Message-Id: <20201027135501.117405092@linuxfoundation.org>
Date:   Tue, 27 Oct 2020 14:47:54 +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,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 224/757] Bluetooth: Clear suspend tasks on unregister

From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>

[ Upstream commit 0e9952804ec9c8ba60f131225eab80634339f042 ]

While unregistering, make sure to clear the suspend tasks before
cancelling the work. If the unregister is called during resume from
suspend, this will unnecessarily add 2s to the resume time otherwise.

Fixes: 4e8c36c3b0d73d (Bluetooth: Fix suspend notifier race)
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bluetooth/hci_core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 68bfe57b66250..efc0fe2b47dac 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3442,6 +3442,16 @@ void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr,
 	}
 }
 
+static void hci_suspend_clear_tasks(struct hci_dev *hdev)
+{
+	int i;
+
+	for (i = 0; i < __SUSPEND_NUM_TASKS; i++)
+		clear_bit(i, hdev->suspend_tasks);
+
+	wake_up(&hdev->suspend_wait_q);
+}
+
 static int hci_suspend_wait_event(struct hci_dev *hdev)
 {
 #define WAKE_COND                                                              \
@@ -3785,6 +3795,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
 	cancel_work_sync(&hdev->power_on);
 
 	unregister_pm_notifier(&hdev->suspend_notifier);
+	hci_suspend_clear_tasks(hdev);
 	cancel_work_sync(&hdev->suspend_prepare);
 
 	hci_dev_do_close(hdev);
-- 
2.25.1