linux-kernel - [PATCH v2 4/6] atmel_serial: Fix bugs in probe() error path and remove()

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Message-Id: <1198077130-9021-5-git-send-email-hskinnemoen@atmel.com>
Date:	Wed, 19 Dec 2007 16:12:08 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	Andrew Victor <linux@...im.org.za>
Cc:	Remy Bohmer <linux@...mer.net>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, kernel@...32linux.org,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: [PATCH v2 4/6] atmel_serial: Fix bugs in probe() error path and remove()

When an error happens in probe(), the clocks should be disabled, but
only if the port isn't already used as a console.

In remove(), the port struct shouldn't be freed because it's defined
statically.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
---
 drivers/serial/atmel_serial.c |   39 +++++++++++++++++++++++++++++----------
 1 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index a6b3828..d2b4b0a 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -941,8 +941,18 @@ static int __init atmel_late_console_init(void)
 
 core_initcall(atmel_late_console_init);
 
+static inline bool atmel_is_console_port(struct uart_port *port)
+{
+	return port->cons && port->cons->index == port->line;
+}
+
 #else
 #define ATMEL_CONSOLE_DEVICE	NULL
+
+static inline bool atmel_is_console_port(struct uart_port *port)
+{
+	return false;
+}
 #endif
 
 static struct uart_driver atmel_uart = {
@@ -1000,9 +1010,19 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev)
 	atmel_init_port(port, pdev);
 
 	ret = uart_add_one_port(&atmel_uart, &port->uart);
-	if (!ret) {
-		device_init_wakeup(&pdev->dev, 1);
-		platform_set_drvdata(pdev, port);
+	if (ret)
+		goto err_add_port;
+
+	device_init_wakeup(&pdev->dev, 1);
+	platform_set_drvdata(pdev, port);
+
+	return 0;
+
+err_add_port:
+	if (!atmel_is_console_port(&port->uart)) {
+		clk_disable(port->clk);
+		clk_put(port->clk);
+		port->clk = NULL;
 	}
 
 	return ret;
@@ -1014,16 +1034,15 @@ static int __devexit atmel_serial_remove(struct platform_device *pdev)
 	struct atmel_uart_port *atmel_port = (struct atmel_uart_port *)port;
 	int ret = 0;
 
-	clk_disable(atmel_port->clk);
-	clk_put(atmel_port->clk);
-
 	device_init_wakeup(&pdev->dev, 0);
 	platform_set_drvdata(pdev, NULL);
 
-	if (port) {
-		ret = uart_remove_one_port(&atmel_uart, port);
-		kfree(port);
-	}
+	ret = uart_remove_one_port(&atmel_uart, port);
+
+	/* "port" is allocated statically, so we shouldn't free it */
+
+	clk_disable(atmel_port->clk);
+	clk_put(atmel_port->clk);
 
 	return ret;
 }
-- 
1.5.3.4

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