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ACPI video: Harden video bus adding.

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It is always better to check return values, so add some new checks and
correct existing ones.

v2: Be consistent and don't mix errors from -E* and AE_* namespaces.

Signed-off-by: Igor Murzov <e-mail@date.by>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Igor Murzov 2012-03-30 21:32:08 +04:00 committed by Len Brown
parent c16fa4f2ad
commit ea9f8856bd
1 changed files with 26 additions and 15 deletions
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41
drivers/acpi/video.c
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@ -548,27 +548,27 @@ acpi_video_device_EDID(struct acpi_video_device *device,
* 1. The system BIOS should NOT automatically control the brightness
* level of the LCD when the power changes from AC to DC.
* Return Value:
* -1 wrong arg.
* -EINVAL wrong arg.
*/
static int
acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
{
u64 status = 0;
acpi_status status;
union acpi_object arg0 = { ACPI_TYPE_INTEGER };
struct acpi_object_list args = { 1, &arg0 };
if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
status = -1;
goto Failed;
}
if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
return -EINVAL;
arg0.integer.value = (lcd_flag << 2) | bios_flag;
video->dos_setting = arg0.integer.value;
acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
status = acpi_evaluate_object(video->device->handle, "_DOS",
&args, NULL);
if (ACPI_FAILURE(status))
return -EIO;
Failed:
return status;
return 0;
}
/*
@ -1343,15 +1343,17 @@ static int
acpi_video_bus_get_devices(struct acpi_video_bus *video,
struct acpi_device *device)
{
int status = 0;
int status;
struct acpi_device *dev;
acpi_video_device_enumerate(video);
status = acpi_video_device_enumerate(video);
if (status)
return status;
list_for_each_entry(dev, &device->children, node) {
status = acpi_video_bus_get_one_device(dev, video);
if (ACPI_FAILURE(status)) {
if (status) {
printk(KERN_WARNING PREFIX
"Can't attach device\n");
continue;
@ -1653,8 +1655,12 @@ static int acpi_video_bus_add(struct acpi_device *device)
mutex_init(&video->device_list_lock);
INIT_LIST_HEAD(&video->video_device_list);
acpi_video_bus_get_devices(video, device);
acpi_video_bus_start_devices(video);
error = acpi_video_bus_get_devices(video, device);
if (error)
goto err_free_video;
error = acpi_video_bus_start_devices(video);
if (error)
goto err_put_video;
video->input = input = input_allocate_device();
if (!input) {
@ -1692,14 +1698,19 @@ static int acpi_video_bus_add(struct acpi_device *device)
video->pm_nb.notifier_call = acpi_video_resume;
video->pm_nb.priority = 0;
register_pm_notifier(&video->pm_nb);
error = register_pm_notifier(&video->pm_nb);
if (error)
goto err_unregister_input_dev;
return 0;
err_unregister_input_dev:
input_unregister_device(input);
err_free_input_dev:
input_free_device(input);
err_stop_video:
acpi_video_bus_stop_devices(video);
err_put_video:
acpi_video_bus_put_devices(video);
kfree(video->attached_array);
err_free_video: