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Date: Fri, 07 Nov 2008 14:42:33 -0800
From: <gregkh@...e.de>
To: julia.jomantaite@...il.com, ak@...ux.intel.com,
arjan@...radead.org, gregkh@...e.de, len.brown@...el.com,
linux-kernel@...r.kernel.org, rui.zhang@...el.com
Cc: <stable@...nel.org>, <stable-commits@...r.kernel.org>
Subject: patch acpi-video-fix-brightness-allocation.patch added to 2.6.25-stable tree
This is a note to let you know that we have just queued up the patch titled
Subject: ACPI: video: fix brightness allocation
to the 2.6.25-stable tree. Its filename is
acpi-video-fix-brightness-allocation.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From lenb@...nel.org Fri Nov 7 14:36:23 2008
From: Julia Jomantaite <julia.jomantaite@...il.com>
Date: Mon, 27 Oct 2008 23:50:57 -0400 (EDT)
Subject: ACPI: video: fix brightness allocation
To: stable@...nel.org
Cc: Julia Jomantaite <julia.jomantaite@...il.com>, linux-acpi@...r.kernel.org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Arjan van de Ven <arjan@...radead.org>
Message-ID: <alpine.LFD.2.00.0810272345580.21631@...alhost.localdomain>
From: Julia Jomantaite <julia.jomantaite@...il.com>
Thanks to Arjan for spotting this for .stable:
http://www.kerneloops.org/search.php?search=acpi_video_switch_brightness
upstream commit 469778c1740fcf3113498b6fdf4559bdec25c58f
ACPI: video: fix brightness allocation
Fix use of uninitialized device->brightness.
Signed-off-by: Julia Jomantaite <julia.jomantaite@...il.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Acked-by: Zhang Rui <rui.zhang@...el.com>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
drivers/acpi/video.c | 123 ++++++++++++++++++++++++++++++---------------------
1 file changed, 73 insertions(+), 50 deletions(-)
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/video.c
@@ -624,6 +624,76 @@ acpi_video_bus_DOS(struct acpi_video_bus
* device : video output device (LCD, CRT, ..)
*
* Return Value:
+ * Maximum brightness level
+ *
+ * Allocate and initialize device->brightness.
+ */
+
+static int
+acpi_video_init_brightness(struct acpi_video_device *device)
+{
+ union acpi_object *obj = NULL;
+ int i, max_level = 0, count = 0;
+ union acpi_object *o;
+ struct acpi_video_device_brightness *br = NULL;
+
+ if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
+ "LCD brightness level\n"));
+ goto out;
+ }
+
+ if (obj->package.count < 2)
+ goto out;
+
+ br = kzalloc(sizeof(*br), GFP_KERNEL);
+ if (!br) {
+ printk(KERN_ERR "can't allocate memory\n");
+ goto out;
+ }
+
+ br->levels = kmalloc(obj->package.count * sizeof *(br->levels),
+ GFP_KERNEL);
+ if (!br->levels)
+ goto out_free;
+
+ for (i = 0; i < obj->package.count; i++) {
+ o = (union acpi_object *)&obj->package.elements[i];
+ if (o->type != ACPI_TYPE_INTEGER) {
+ printk(KERN_ERR PREFIX "Invalid data\n");
+ continue;
+ }
+ br->levels[count] = (u32) o->integer.value;
+
+ if (br->levels[count] > max_level)
+ max_level = br->levels[count];
+ count++;
+ }
+
+ if (count < 2)
+ goto out_free_levels;
+
+ br->count = count;
+ device->brightness = br;
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count));
+ kfree(obj);
+ return max_level;
+
+out_free_levels:
+ kfree(br->levels);
+out_free:
+ kfree(br);
+out:
+ device->brightness = NULL;
+ kfree(obj);
+ return 0;
+}
+
+/*
+ * Arg:
+ * device : video output device (LCD, CRT, ..)
+ *
+ * Return Value:
* None
*
* Find out all required AML methods defined under the output
@@ -633,10 +703,7 @@ acpi_video_bus_DOS(struct acpi_video_bus
static void acpi_video_device_find_cap(struct acpi_video_device *device)
{
acpi_handle h_dummy1;
- int i;
u32 max_level = 0;
- union acpi_object *obj = NULL;
- struct acpi_video_device_brightness *br = NULL;
memset(&device->cap, 0, sizeof(device->cap));
@@ -665,53 +732,7 @@ static void acpi_video_device_find_cap(s
device->cap._DSS = 1;
}
- if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
-
- if (obj->package.count >= 2) {
- int count = 0;
- union acpi_object *o;
-
- br = kzalloc(sizeof(*br), GFP_KERNEL);
- if (!br) {
- printk(KERN_ERR "can't allocate memory\n");
- } else {
- br->levels = kmalloc(obj->package.count *
- sizeof *(br->levels), GFP_KERNEL);
- if (!br->levels)
- goto out;
-
- for (i = 0; i < obj->package.count; i++) {
- o = (union acpi_object *)&obj->package.
- elements[i];
- if (o->type != ACPI_TYPE_INTEGER) {
- printk(KERN_ERR PREFIX "Invalid data\n");
- continue;
- }
- br->levels[count] = (u32) o->integer.value;
-
- if (br->levels[count] > max_level)
- max_level = br->levels[count];
- count++;
- }
- out:
- if (count < 2) {
- kfree(br->levels);
- kfree(br);
- } else {
- br->count = count;
- device->brightness = br;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "found %d brightness levels\n",
- count));
- }
- }
- }
-
- } else {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
- }
-
- kfree(obj);
+ max_level = acpi_video_init_brightness(device);
if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
int result;
@@ -1710,6 +1731,8 @@ static void
acpi_video_switch_brightness(struct acpi_video_device *device, int event)
{
unsigned long level_current, level_next;
+ if (!device->brightness)
+ return;
acpi_video_device_lcd_get_level_current(device, &level_current);
level_next = acpi_video_get_next_level(device, level_current, event);
acpi_video_device_lcd_set_level(device, level_next);
Patches currently in stable-queue which might be from julia.jomantaite@...il.com are
queue-2.6.25/acpi-video-fix-brightness-allocation.patch
--
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