Bluetooth: Handle Inquiry Cancel error after Inquiry Complete (adf1d692) · Commits · 戴 / test

After sending Inquiry Cancel command to the controller, it is possible that Inquiry Complete event comes before Inquiry Cancel command complete event. In this case the Inquiry Cancel command will have status of Command Disallowed since there is no Inquiry session to be cancelled. This case should not be treated as error, otherwise we can reach an inconsistent state. Example of a btmon trace when this happened: < HCI Command: Inquiry Cancel (0x01|0x0002) plen 0 > HCI Event: Inquiry Complete (0x01) plen 1 Status: Success (0x00) > HCI Event: Command Complete (0x0e) plen 4 Inquiry Cancel (0x01|0x0002) ncmd 1 Status: Command Disallowed (0x0c) Signed-off-by:

Sonny Sasaka <sonnysasaka@chromium.org> Signed-off-by:

Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/hci_event.c

+17 −2

Original line number	Diff line number	Diff line
		@@ -42,12 +42,27 @@

		/* Handle HCI Event packets */

		static void hci_cc_inquiry_cancel(struct hci_dev hdev, struct sk_buff skb)
		static void hci_cc_inquiry_cancel(struct hci_dev hdev, struct sk_buff skb,
		u8 *new_status)
		{
		__u8 status = ((__u8 ) skb->data);

		BT_DBG("%s status 0x%2.2x", hdev->name, status);

		/* It is possible that we receive Inquiry Complete event right
		* before we receive Inquiry Cancel Command Complete event, in
		* which case the latter event should have status of Command
		* Disallowed (0x0c). This should not be treated as error, since
		* we actually achieve what Inquiry Cancel wants to achieve,
		* which is to end the last Inquiry session.
		*/
		if (status == 0x0c && !test_bit(HCI_INQUIRY, &hdev->flags)) {
		bt_dev_warn(hdev, "Ignoring error of Inquiry Cancel command");
		status = 0x00;
		}

		*new_status = status;

		if (status)
		return;

		@@ -3233,7 +3248,7 @@ static void hci_cmd_complete_evt(struct hci_dev hdev, struct sk_buff skb,

		switch (*opcode) {
		case HCI_OP_INQUIRY_CANCEL:
		hci_cc_inquiry_cancel(hdev, skb);
		hci_cc_inquiry_cancel(hdev, skb, status);
		break;

		case HCI_OP_PERIODIC_INQ:

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