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From:   Qiqi Zhang <eddy.zhang@rock-chips.com>
To:     marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com
Cc:     linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org,
        Qiqi Zhang <eddy.zhang@rock-chips.com>
Subject: [PATCH] Bluetooth: hci_h5: Complements reliable packet processing logic.
Date:   Tue,  4 Apr 2023 00:29:28 +0800
Message-Id: <20230403162928.118172-1-eddy.zhang@rock-chips.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
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As shown in the schematic diagram below.There may be a critical
scenario in the current code. If the device does not receive an
pure ack sent by the host due to insufficient receive buffer or
other reasons and triggers a retransmission, the host will always
be in an 'out-of-order' state.The state machine will get stuck.

       host                 device
     SEQ3,ACK4 --------->
               <--------- SEQ4,ACK4
     pure ACK  ---------> (not received)
(out-of-order) <--------- SEQ4,ACK4(retransmission)
		........
(out-of-order) <--------- SEQ4,ACK4(retransmission)

According to the description in the core specification: "whenever
a reliable packet is received, an acknowledgment shall be generated."
we should set H5_TX_ACK_REQ bit to trigger retransmission of pure ack
packet when "out-of-order" occurs.

Signed-off-by: Qiqi Zhang <eddy.zhang@rock-chips.com>
---
 drivers/bluetooth/hci_h5.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 6455bc4fb5bb..d05eaeaa4516 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -463,6 +463,8 @@ static int h5_rx_3wire_hdr(struct hci_uart *hu, unsigned char c)
 	if (H5_HDR_RELIABLE(hdr) && H5_HDR_SEQ(hdr) != h5->tx_ack) {
 		bt_dev_err(hu->hdev, "Out-of-order packet arrived (%u != %u)",
 			   H5_HDR_SEQ(hdr), h5->tx_ack);
+		set_bit(H5_TX_ACK_REQ, &h5->flags);
+		hci_uart_tx_wakeup(hu);
 		h5_reset_rx(h5);
 		return 0;
 	}
-- 
2.25.1