linux-kernel - [PATCH 1/2] acpi: don't free non-existant backlight in acpi video module

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Date:	Sat, 11 Jul 2009 23:47:31 -0700
From:	keithp@...thp.com
To:	rui.zhang@...el.com
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	keithp@...thp.com
Subject: [PATCH 1/2] acpi: don't free non-existant backlight in acpi video module

From: Keith Packard <keithp@...thp.com>

acpi_video_put_one_device was attempting to remove sysfs entries and
unregister a backlight device without first checking that said backlight
device structure had been created.

Signed-off-by: Keith Packard <keithp@...thp.com>
---
 drivers/acpi/video.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
index 8851315..60ea984 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -2004,8 +2004,11 @@ static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
 	status = acpi_remove_notify_handler(device->dev->handle,
 					    ACPI_DEVICE_NOTIFY,
 					    acpi_video_device_notify);
-	sysfs_remove_link(&device->backlight->dev.kobj, "device");
-	backlight_device_unregister(device->backlight);
+	if (device->backlight) {
+		sysfs_remove_link(&device->backlight->dev.kobj, "device");
+		backlight_device_unregister(device->backlight);
+		device->backlight = NULL;
+	}
 	if (device->cdev) {
 		sysfs_remove_link(&device->dev->dev.kobj,
 				  "thermal_cooling");
-- 
1.6.3.3

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