diff mbox series

[v3,3/4] Bluetooth: btusb: mediatek: add intf release flow when usb disconnect

Message ID 20240923084705.14123-4-chris.lu@mediatek.com (mailing list archive)
State Accepted
Commit 6f3f7e9414834fc4210a2d11ff6172031e98d9ff
Headers show
Series Bluetooth: btusb: Mediatek ISO interface claim/release adjustment | expand

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Context Check Description
tedd_an/pre-ci_am success Success
tedd_an/CheckPatch success CheckPatch PASS
tedd_an/GitLint success Gitlint PASS
tedd_an/SubjectPrefix success Gitlint PASS

Commit Message

Chris Lu Sept. 23, 2024, 8:47 a.m. UTC
MediaTek claim an special usb intr interface for ISO data transmission.
The interface need to be released before unregistering hci device when
usb disconnect. Removing BT usb dongle without properly releasing the
interface may cause Kernel panic while unregister hci device.

Signed-off-by: Chris Lu <chris.lu@mediatek.com>
---
 drivers/bluetooth/btusb.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index dfc42bdc8aaf..a434aefe68f2 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2614,9 +2614,9 @@  static void btusb_mtk_claim_iso_intf(struct btusb_data *data)
 	set_bit(BTMTK_ISOPKT_OVER_INTR, &btmtk_data->flags);
 }
 
-static void btusb_mtk_release_iso_intf(struct btusb_data *data)
+static void btusb_mtk_release_iso_intf(struct hci_dev *hdev)
 {
-	struct btmtk_data *btmtk_data = hci_get_priv(data->hdev);
+	struct btmtk_data *btmtk_data = hci_get_priv(hdev);
 
 	if (btmtk_data->isopkt_intf) {
 		usb_kill_anchored_urbs(&btmtk_data->isopkt_anchor);
@@ -2632,6 +2632,16 @@  static void btusb_mtk_release_iso_intf(struct btusb_data *data)
 	clear_bit(BTMTK_ISOPKT_OVER_INTR, &btmtk_data->flags);
 }
 
+static int btusb_mtk_disconnect(struct hci_dev *hdev)
+{
+	/* This function describes the specific additional steps taken by MediaTek
+	 * when Bluetooth usb driver's resume function is called.
+	 */
+	btusb_mtk_release_iso_intf(hdev);
+
+	return 0;
+}
+
 static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
 {
 	struct btusb_data *data = hci_get_drvdata(hdev);
@@ -2649,7 +2659,7 @@  static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
 		return err;
 
 	if (test_bit(BTMTK_ISOPKT_RUNNING, &btmtk_data->flags))
-		btusb_mtk_release_iso_intf(data);
+		btusb_mtk_release_iso_intf(hdev);
 
 	btusb_stop_traffic(data);
 	usb_kill_anchored_urbs(&data->tx_anchor);
@@ -2703,14 +2713,13 @@  static int btusb_mtk_setup(struct hci_dev *hdev)
 
 static int btusb_mtk_shutdown(struct hci_dev *hdev)
 {
-	struct btusb_data *data = hci_get_drvdata(hdev);
 	struct btmtk_data *btmtk_data = hci_get_priv(hdev);
 	int ret;
 
 	ret = btmtk_usb_shutdown(hdev);
 
 	if (test_bit(BTMTK_ISOPKT_RUNNING, &btmtk_data->flags))
-		btusb_mtk_release_iso_intf(data);
+		btusb_mtk_release_iso_intf(hdev);
 
 	return ret;
 }
@@ -3824,6 +3833,7 @@  static int btusb_probe(struct usb_interface *intf,
 		data->recv_acl = btmtk_usb_recv_acl;
 		data->suspend = btmtk_usb_suspend;
 		data->resume = btmtk_usb_resume;
+		data->disconnect = btusb_mtk_disconnect;
 	}
 
 	if (id->driver_info & BTUSB_SWAVE) {