linux-kernel - [PATCH] serial: stm32: fix a recursive locking in stm32_config

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Message-Id: <20190604095452.6360-1-borut.seljak@t-2.net>
Date:   Tue,  4 Jun 2019 11:54:51 +0200
From:   Borut Seljak <borut.seljak@....net>
To:     unlisted-recipients:; (no To-header on input)
Cc:     borut.seljak@....net,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-serial@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
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.

Signed-off-by: Borut Seljak <borut.seljak@....net>
---
 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;
 }
-- 
2.17.1