Hi Borut,
Please add the following line in the commit message (before your
sign-off) in a V2 of your patch:
fixes: 1bcda09d291081 ("serial: stm32: add support for RS485 hardware
control mode")
I'm OK with the patch itself.
Erwan.
Subject: [PATCH] serial: stm32: fix a recursive locking in
> stm32_config_rs485
> Date: Tue, 4 Jun 2019 11:54:51 +0200
> From: Borut Seljak <borut.seljak@xxxxxxx>
> CC: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>, Alexandre Torgue
> <alexandre.torgue@xxxxxx>, Greg Kroah-Hartman
> <gregkh@xxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx,
> borut.seljak@xxxxxxx, linux-serial@xxxxxxxxxxxxxxx, Jiri Slaby
> <jslaby@xxxxxxxx>, linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx,
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
>
> Remove spin_lock_irqsave in stm32_config_rs485, it cause recursive locking.
> Already locked in uart_set_rs485_config.
>
> Signed-off-by: Borut Seljak <borut.seljak@xxxxxxx>
> ---
> drivers/tty/serial/stm32-usart.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/tty/serial/stm32-usart.c
> b/drivers/tty/serial/stm32-usart.c
> index e8d7a7bb4339..da373a465f51 100644
> --- a/drivers/tty/serial/stm32-usart.c
> +++ b/drivers/tty/serial/stm32-usart.c
> @@ -107,7 +107,6 @@ static int stm32_config_rs485(struct uart_port *port,
> bool over8;
> unsigned long flags;
> - spin_lock_irqsave(&port->lock, flags);
> stm32_clr_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
> port->rs485 = *rs485conf;
> @@ -147,7 +146,6 @@ static int stm32_config_rs485(struct uart_port *port,
> }
> stm32_set_bits(port, ofs->cr1, BIT(cfg->uart_enable_bit));
> - spin_unlock_irqrestore(&port->lock, flags);
> return 0;
> }
