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ACPI video: check the return value of acpi_video_device_lcd_get_level_current 

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Matthew Garrett <mjg59@srcf.ucam.org>
Acked-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhang Rui 2009-03-18 16:27:08 +08:00 committed by Len Brown
parent 8e0ee43bc2
commit c8890f903a
1 changed files with 45 additions and 10 deletions
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55
drivers/acpi/video.c
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@ -294,7 +294,7 @@ static int acpi_video_device_lcd_get_level_current(
unsigned long long *level);
static int acpi_video_get_next_level(struct acpi_video_device *device,
u32 level_current, u32 event);
static void acpi_video_switch_brightness(struct acpi_video_device *device,
static int acpi_video_switch_brightness(struct acpi_video_device *device,
int event);
static int acpi_video_device_get_state(struct acpi_video_device *device,
unsigned long long *state);
@ -308,7 +308,9 @@ static int acpi_video_get_brightness(struct backlight_device *bd)
int i;
struct acpi_video_device *vd =
(struct acpi_video_device *)bl_get_data(bd);
acpi_video_device_lcd_get_level_current(vd, &cur_level);
if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
return -EINVAL;
for (i = 2; i < vd->brightness->count; i++) {
if (vd->brightness->levels[i] == cur_level)
/* The first two entries are special - see page 575
@ -373,7 +375,8 @@ static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
unsigned long long level;
int state;
acpi_video_device_lcd_get_level_current(video, &level);
if (acpi_video_device_lcd_get_level_current(video, &level))
return -EINVAL;
for (state = 2; state < video->brightness->count; state++)
if (level == video->brightness->levels[state])
return sprintf(buf, "%d\n",
@ -502,11 +505,29 @@ static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
unsigned long long *level)
{
if (device->cap._BQC)
return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
level);
acpi_status status = AE_OK;
if (device->cap._BQC) {
status = acpi_evaluate_integer(device->dev->handle, "_BQC",
NULL, level);
if (ACPI_SUCCESS(status)) {
device->brightness->curr = *level;
return 0;
} else {
/* Fixme:
* should we return an error or ignore this failure?
* dev->brightness->curr is a cached value which stores
* the correct current backlight level in most cases.
* ACPI video backlight still works w/ buggy _BQC.
* http://bugzilla.kernel.org/show_bug.cgi?id=12233
*/
ACPI_WARNING((AE_INFO, "Evaluating _BQC failed"));
device->cap._BQC = 0;
}
}
*level = device->brightness->curr;
return AE_OK;
return 0;
}
static int
@ -1749,15 +1770,29 @@ acpi_video_get_next_level(struct acpi_video_device *device,
}
}
static void
static int
acpi_video_switch_brightness(struct acpi_video_device *device, int event)
{
unsigned long long level_current, level_next;
int result = -EINVAL;
if (!device->brightness)
return;
acpi_video_device_lcd_get_level_current(device, &level_current);
goto out;
result = acpi_video_device_lcd_get_level_current(device,
&level_current);
if (result)
goto out;
level_next = acpi_video_get_next_level(device, level_current, event);
acpi_video_device_lcd_set_level(device, level_next);
out:
if (result)
printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
return result;
}
static int