linux-kernel - [PATCH 4.19 417/639] serial: stm32: fix a recursive locking in stm32_config

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Message-Id: <20200124093139.236423702@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:29:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Borut Seljak <borut.seljak@....net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 417/639] serial: stm32: fix a recursive locking in stm32_config_rs485

From: Borut Seljak <borut.seljak@....net>

[ Upstream commit 707aeea13a9c85520262e11899d86df3c4b48262 ]

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 <borut.seljak@....net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 1334e42939776..d096e552176cc 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;
 }
-- 
2.20.1