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Date:   Thu, 20 Apr 2023 20:23:36 +0800
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Message-ID: <20230420202312.1.I53bc906a716045c7474a77d3038bfcb6909094e2@changeid>
Subject: [PATCH] Bluetooth: Cancel sync command before suspend and power off
From:   Archie Pusaka <apusaka@google.com>
To:     linux-bluetooth <linux-bluetooth@vger.kernel.org>,
        Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
        Marcel Holtmann <marcel@holtmann.org>
Cc:     CrosBT Upstreaming <chromeos-bluetooth-upstreaming@chromium.org>,
        Archie Pusaka <apusaka@chromium.org>,
        Ying Hsu <yinghsu@chromium.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        Paolo Abeni <pabeni@redhat.com>, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org
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From: Archie Pusaka <apusaka@chromium.org>

Some of the sync commands might take a long time to complete, e.g.
LE Create Connection when the peer device isn't responding might take
20 seconds before it times out. If suspend command is issued during
this time, it will need to wait for completion since both commands are
using the same sync lock.

This patch cancel any running sync commands before attempting to
suspend or adapter power off.

Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Ying Hsu <yinghsu@chromium.org>

---

 net/bluetooth/hci_core.c | 3 +++
 net/bluetooth/mgmt.c     | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 393b317ae68f6..a856b1051d355 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2803,6 +2803,9 @@ int hci_suspend_dev(struct hci_dev *hdev)
 	if (mgmt_powering_down(hdev))
 		return 0;
 
+	/* Cancel potentially blocking sync operation before suspend */
+	__hci_cmd_sync_cancel(hdev, -EHOSTDOWN);
+
 	hci_req_sync_lock(hdev);
 	ret = hci_suspend_sync(hdev);
 	hci_req_sync_unlock(hdev);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 5f8c144c84b88..13c745876b390 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1399,6 +1399,10 @@ static int set_powered(struct sock *sk, struct hci_dev *hdev, void *data,
 		goto failed;
 	}
 
+	/* Cancel potentially blocking sync operation before power off */
+	if (cp->val == 0x00)
+		__hci_cmd_sync_cancel(hdev, -EHOSTDOWN);
+
 	err = hci_cmd_sync_queue(hdev, set_powered_sync, cmd,
 				 mgmt_set_powered_complete);
 
-- 
2.40.0.634.g4ca3ef3211-goog