hci_uart_tty_close() is detaching the tty prematurely which prevents
the Data Link protocol layer from using the tty serial port in the
call to hci_unregister_dev().
Consequently, when hci_unregister_dev() attempts to send a HCI RESET
command, the BCSP layer attempts to retransmit the message many times
and the command is timed-out after HCI_CMD_TIMEOUT (2) seconds.
Nothing was physically transmitted because the tty was detached too
early.
Therefore, move the detach statement "tty->disc_data = NULL" to after
hci_unregister_dev() so that the HCI RESET command maybe sent and
acknowledged.
Signed-off-by: Dean Jenkins <Dean_Jenkins@xxxxxxxxxx>
---
drivers/bluetooth/hci_ldisc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 2d5c6f0..e7d1b8b 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -493,9 +493,6 @@ static void hci_uart_tty_close(struct tty_struct *tty)
BT_DBG("tty %p", tty);
- /* Detach from the tty */
- tty->disc_data = NULL;
-
if (!hu)
return;
@@ -517,6 +514,9 @@ static void hci_uart_tty_close(struct tty_struct *tty)
hu->proto->close(hu);
}
+ /* Detach from the tty */
+ tty->disc_data = NULL;
+
clear_bit(HCI_UART_PROTO_SET, &hu->flags);
if (test_and_clear_bit(HCI_UART_REGISTERED, &hu->flags)) {
--
2.7.4
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