linux-kernel - [patch 3/6] ACPI fan: extract return values using PTR

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Date:	Fri, 15 Feb 2008 10:53:38 +0530
From:	"Thomas, Sujith" <sujith.thomas@...el.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	<lenb@...nel.org>, <mingo@...e.hu>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-pm@...ts.linux-foundation.org>,
	"Zhang, Rui" <rui.zhang@...el.com>
Subject: [patch 3/6] ACPI fan: extract return values using PTR_ERR

From: Thomas Sujith <sujith.thomas@...el.com>

Need to extract errors using PTR_ERR macro and
process accordingly.thermal_cooling_device_register
returning NULL means that CONFIG_THERMAL=n and in that
case no need to create symbolic links.

Signed-off-by: Thomas Sujith <sujith.thomas@...el.com>
---

 drivers/acpi/fan.c |   30 ++++++++++++++++++------------
 1 files changed, 18 insertions(+), 12 deletions(-)

Index: linux-2.6.24/drivers/acpi/fan.c
===================================================================
--- linux-2.6.24.orig/drivers/acpi/fan.c
+++ linux-2.6.24/drivers/acpi/fan.c
@@ -256,22 +256,28 @@ static int acpi_fan_add(struct acpi_devi
 
 	cdev = thermal_cooling_device_register("Fan", device,
 						&fan_cooling_ops);
-	if (cdev)
+	if (IS_ERR(cdev)) {
+		result = PTR_ERR(cdev);
+		goto end;
+	}
+	if (cdev) {
 		printk(KERN_INFO PREFIX
 			"%s is registered as cooling_device%d\n",
 			device->dev.bus_id, cdev->id);
-	else
-		goto end;
-	acpi_driver_data(device) = cdev;
-	result = sysfs_create_link(&device->dev.kobj,
&cdev->device.kobj,
-					"thermal_cooling");
-	if (result)
-		return result;
 
-	result = sysfs_create_link(&cdev->device.kobj,
&device->dev.kobj,
-                                       "device");
-        if (result)
-                return result;
+		acpi_driver_data(device) = cdev;
+		result = sysfs_create_link(&device->dev.kobj,
+					   &cdev->device.kobj,
+					   "thermal_cooling");
+		if (result)
+			return result;
+
+		result = sysfs_create_link(&cdev->device.kobj,
+					   &device->dev.kobj,
+					   "device");
+		if (result)
+			return result;
+	}
 
 	result = acpi_fan_add_fs(device);
 	if (result)

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