From 707aeea13a9c85520262e11899d86df3c4b48262 Mon Sep 17 00:00:00 2001 From: Borut Seljak Date: Fri, 7 Jun 2019 12:53:06 +0200 Subject: [PATCH] serial: stm32: fix a recursive locking in stm32_config_rs485 Remove spin_lock_irqsave in stm32_config_rs485, it cause recursive locking. Already locked in uart_set_rs485_config. Fixes: 1bcda09d291081 ("serial: stm32: add support for RS485 hardware control mode") Signed-off-by: Borut Seljak Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/stm32-usart.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 4c217fb..7a46d7b 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -105,9 +105,7 @@ static int stm32_config_rs485(struct uart_port *port, struct stm32_usart_config *cfg = &stm32_port->info->cfg; u32 usartdiv, baud, cr1, cr3; 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 +145,6 @@ 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; } -- 2.7.4