5.4-stable review patch. If anyone has any objections, please let me know.
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From: Arseniy Krasnov avkrasnov@salutedevices.com
[ Upstream commit 366ceff495f902182d42b6f41525c2474caf3f9a ]
'hci_register_dev()' calls power up function, which is executed by kworker - 'hci_power_on()'. This function does access to bluetooth chip using callbacks from 'hci_ldisc.c', for example 'hci_uart_send_frame()'. Now 'hci_uart_send_frame()' checks 'HCI_UART_PROTO_READY' bit set, and if not - it fails. Problem is that 'HCI_UART_PROTO_READY' is set after 'hci_register_dev()', and there is tiny chance that 'hci_power_on()' will be executed before setting this bit. In that case HCI init logic fails.
Patch moves setting of 'HCI_UART_PROTO_READY' before calling function 'hci_uart_register_dev()'.
Signed-off-by: Arseniy Krasnov avkrasnov@salutedevices.com Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/bluetooth/hci_ldisc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index 600c88fc3145f..8e4a23cd40218 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -703,12 +703,13 @@ static int hci_uart_set_proto(struct hci_uart *hu, int id)
hu->proto = p;
+ set_bit(HCI_UART_PROTO_READY, &hu->flags); + err = hci_uart_register_dev(hu); if (err) { return err; }
- set_bit(HCI_UART_PROTO_READY, &hu->flags); return 0; }