linux-kernel - [patch 4/6] ACPI processor: extract return values using PTR

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Date:	Fri, 15 Feb 2008 10:54:07 +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 4/6] ACPI processor: 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/processor_core.c |   27 ++++++++++++++++-----------
 1 files changed, 16 insertions(+), 11 deletions(-)

Index: linux-2.6.24/drivers/acpi/processor_core.c
===================================================================
--- linux-2.6.24.orig/drivers/acpi/processor_core.c
+++ linux-2.6.24/drivers/acpi/processor_core.c
@@ -670,21 +670,26 @@ static int __cpuinit acpi_processor_star
 
 	pr->cdev = thermal_cooling_device_register("Processor", device,
 						&processor_cooling_ops);
-	if (pr->cdev)
+	if (IS_ERR(pr->cdev)) {
+		result = PTR_ERR(pr->cdev);
+		goto end;
+	}
+	if (pr->cdev) {
 		printk(KERN_INFO PREFIX
 			"%s is registered as cooling_device%d\n",
 			device->dev.bus_id, pr->cdev->id);
-	else
-		goto end;
 
-	result = sysfs_create_link(&device->dev.kobj,
&pr->cdev->device.kobj,
-					"thermal_cooling");
-	if (result)
-		return result;
-	result = sysfs_create_link(&pr->cdev->device.kobj,
&device->dev.kobj,
-					"device");
-	if (result)
-		return result;
+		result = sysfs_create_link(&device->dev.kobj,
+					   &pr->cdev->device.kobj,
+					   "thermal_cooling");
+		if (result)
+			return result;
+		result = sysfs_create_link(&pr->cdev->device.kobj,
+					   &device->dev.kobj,
+					   "device");
+		if (result)
+			return result;
+	}
 
 	if (pr->flags.throttling) {
 		printk(KERN_INFO PREFIX "%s [%s] (supports",

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