linux-kernel - [PATCH 2/4] use pr->cdev as a condition for cleanup

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Date:	Mon, 18 Feb 2008 17:56:51 -0300
From:	Glauber Costa <gcosta@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, andrew.grover@...el.com,
	paul.s.diefenbaugh@...el.com, linux@...do.de,
	anil.s.keshavamurthy@...el.com, lenb@...nel.org,
	linux-acpi@...r.kernel.org, Glauber Costa <gcosta@...hat.com>
Subject: [PATCH 2/4] use pr->cdev as a condition for cleanup

The acpi_processor_start() function can fail before creating the
sysfs nodes for thermal cooling. In this case, pr->cdev will be NULL,
and the removal code will break.

This patch uses pr->cdev as a criteria for termination of the
mentioned code, and avoids it, if it was never initialized.

Signed-off-by: Glauber Costa <gcosta@...hat.com>
---
 drivers/acpi/processor_core.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 9480203..5023410 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -811,10 +811,12 @@ static int acpi_processor_remove(struct 
 
 	acpi_processor_remove_fs(device);
 
-	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
-	sysfs_remove_link(&pr->cdev->device.kobj, "device");
-	thermal_cooling_device_unregister(pr->cdev);
-	pr->cdev = NULL;
+	if (pr->cdev) {
+		sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
+		sysfs_remove_link(&pr->cdev->device.kobj, "device");
+		thermal_cooling_device_unregister(pr->cdev);
+		pr->cdev = NULL;
+	}
 
 	processors[pr->id] = NULL;
 
-- 
1.4.2

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