linux-kernel - [PATCH 5.7 136/393] Bluetooth: Allow suspend even when preparation has failed

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Date:   Mon, 17 Aug 2020 17:13:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Len Brown <len.brown@...el.com>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 136/393] Bluetooth: Allow suspend even when preparation has failed

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

[ Upstream commit a9ec8423134a54c9f0ae8d4ef59e1e833ca917c2 ]

It is preferable to allow suspend even when Bluetooth has problems
preparing for sleep. When Bluetooth fails to finish preparing for
suspend, log the error and allow the suspend notifier to continue
instead.

To also make it clearer why suspend failed, change bt_dev_dbg to
bt_dev_err when handling the suspend timeout.

Fixes: dd522a7429b07e ("Bluetooth: Handle LE devices during suspend")
Reported-by: Len Brown <len.brown@...el.com>
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 | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2e7bc2da8371d..828847ac4b33c 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3280,10 +3280,10 @@ static int hci_suspend_wait_event(struct hci_dev *hdev)
 				     WAKE_COND, SUSPEND_NOTIFIER_TIMEOUT);
 
 	if (ret == 0) {
-		bt_dev_dbg(hdev, "Timed out waiting for suspend");
+		bt_dev_err(hdev, "Timed out waiting for suspend events");
 		for (i = 0; i < __SUSPEND_NUM_TASKS; ++i) {
 			if (test_bit(i, hdev->suspend_tasks))
-				bt_dev_dbg(hdev, "Bit %d is set", i);
+				bt_dev_err(hdev, "Suspend timeout bit: %d", i);
 			clear_bit(i, hdev->suspend_tasks);
 		}
 
@@ -3349,12 +3349,15 @@ static int hci_suspend_notifier(struct notifier_block *nb, unsigned long action,
 		ret = hci_change_suspend_state(hdev, BT_RUNNING);
 	}
 
-	/* If suspend failed, restore it to running */
-	if (ret && action == PM_SUSPEND_PREPARE)
-		hci_change_suspend_state(hdev, BT_RUNNING);
-
 done:
-	return ret ? notifier_from_errno(-EBUSY) : NOTIFY_STOP;
+	/* We always allow suspend even if suspend preparation failed and
+	 * attempt to recover in resume.
+	 */
+	if (ret)
+		bt_dev_err(hdev, "Suspend notifier action (%lu) failed: %d",
+			   action, ret);
+
+	return NOTIFY_STOP;
 }
 
 /* Alloc HCI device */
-- 
2.25.1