linux-kernel - [PATCH 4/4 v4] serial: tty: Cleanup code using devm

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Date:	Fri, 18 Jan 2013 15:05:32 +1300
From:	Tony Prisk <linux@...sktech.co.nz>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Tony Prisk <linux@...sktech.co.nz>
Subject: [PATCH 4/4 v4] serial: tty: Cleanup code using devm_ function

Convert the last memory allocation (vt8500_port) to use devm_kzalloc
and remove the fail path cleanup code from vt8500_serial_probe.

Reorder iomem mapping above clk_enable to simplify fail code. The
clock is only enabled if all other resources are available.

Signed-off-by: Tony Prisk <linux@...sktech.co.nz>
---
 drivers/tty/serial/vt8500_serial.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c
index 1061e57..b834d99 100644
--- a/drivers/tty/serial/vt8500_serial.c
+++ b/drivers/tty/serial/vt8500_serial.c
@@ -589,7 +589,8 @@ static int vt8500_serial_probe(struct platform_device *pdev)
 		return -EBUSY;
 	}
 
-	vt8500_port = kzalloc(sizeof(struct vt8500_port), GFP_KERNEL);
+	vt8500_port = devm_kzalloc(&pdev->dev, sizeof(struct vt8500_port),
+				   GFP_KERNEL);
 	if (!vt8500_port)
 		return -ENOMEM;
 
@@ -600,14 +601,13 @@ static int vt8500_serial_probe(struct platform_device *pdev)
 	vt8500_port->clk = of_clk_get(pdev->dev.of_node, 0);
 	if (IS_ERR(vt8500_port->clk)) {
 		dev_err(&pdev->dev, "failed to get clock\n");
-		ret = -EINVAL;
-		goto err;
+		return  -EINVAL;
 	}
 
 	ret = clk_prepare_enable(vt8500_port->clk);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to enable clock\n");
-		goto err;
+		return ret;
 	}
 
 	vt8500_port->uart.type = PORT_VT8500;
@@ -631,10 +631,6 @@ static int vt8500_serial_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, vt8500_port);
 
 	return 0;
-
-err:
-	kfree(vt8500_port);
-	return ret;
 }
 
 static int vt8500_serial_remove(struct platform_device *pdev)
@@ -644,7 +640,6 @@ static int vt8500_serial_remove(struct platform_device *pdev)
 	platform_set_drvdata(pdev, NULL);
 	clk_disable_unprepare(vt8500_port->clk);
 	uart_remove_one_port(&vt8500_uart_driver, &vt8500_port->uart);
-	kfree(vt8500_port);
 
 	return 0;
 }
-- 
1.7.9.5

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