linux-kernel - [PATCH] usb: bluetooth: get lock before calling usb_[disable|enable]

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Message-ID: <20210802221429.GA1370657@pc>
Date:   Mon, 2 Aug 2021 23:14:29 +0100
From:   Salah Triki <salah.triki@...il.com>
To:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        gregkh@...uxfoundation.org
Cc:     linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] usb: bluetooth: get lock before calling
 usb_[disable|enable]_autosuspend()

Based on the documentation of usb_[disable|enable]_autosuspend(), the
caller must hold udev's device lock.

Signed-off-by: Salah Triki <salah.triki@...il.com>
---
 drivers/bluetooth/btusb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index a9855a2dd561..2ceb48164b6d 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1939,8 +1939,11 @@ static int btusb_setup_csr(struct hci_dev *hdev)
 
 			device_set_wakeup_capable(&data->udev->dev, false);
 			/* Re-enable autosuspend if this was requested */
-			if (enable_autosuspend)
+			if (enable_autosuspend) {
+				usb_lock_device(data->udev);
 				usb_enable_autosuspend(data->udev);
+				usb_unlock_device(data->udev);
+			}
 		}
 	}
 
-- 
2.25.1