linux-kernel - [PATCH 6/9] serial: stm32: fix error handling in probe

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Date:   Thu, 13 Jul 2017 15:08:29 +0000
From:   Bich HEMON <bich.hemon@...com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "Jiri Slaby" <jslaby@...e.com>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Bich HEMON <bich.hemon@...com>
Subject: [PATCH 6/9] serial: stm32: fix error handling in probe

From: Fabrice Gasnier <fabrice.gasnier@...com>

Disable clock properly in case of error.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
Signed-off-by: Bich Hemon <bich.hemon@...com>
---
 drivers/tty/serial/stm32-usart.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 9158d31..413ff49 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -678,8 +678,10 @@ static int stm32_init_port(struct stm32_port *stm32port,
 		return ret;
 
 	stm32port->port.uartclk = clk_get_rate(stm32port->clk);
-	if (!stm32port->port.uartclk)
+	if (!stm32port->port.uartclk) {
+		clk_disable_unprepare(stm32port->clk);
 		ret = -EINVAL;
+	}
 
 	return ret;
 }
@@ -865,7 +867,7 @@ static int stm32_serial_probe(struct platform_device *pdev)
 
 	ret = uart_add_one_port(&stm32_usart_driver, &stm32port->port);
 	if (ret)
-		return ret;
+		goto err_uninit;
 
 	ret = stm32_of_dma_rx_probe(stm32port, pdev);
 	if (ret)
@@ -878,6 +880,11 @@ static int stm32_serial_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, &stm32port->port);
 
 	return 0;
+
+err_uninit:
+	clk_disable_unprepare(stm32port->clk);
+
+	return ret;
 }
 
 static int stm32_serial_remove(struct platform_device *pdev)
-- 
1.9.1