kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

ACPI/PCI: Change pci_osc_control_set() to query control bits first

Browse source 
Current pci_osc_control_set() evaluates _OSC without query for control
bits, unless __pci_osc_support_set() is called beforehand. But as
strongly recommended in PCI firmware specification, it should query
control bits first.

This patch changes pci_osc_control_set() to query control bits first
even if __pci_osc_support_set() is not called beforehand.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Taku Izumi 2008-10-17 13:49:46 +09:00 committed by Jesse Barnes
parent 9778c14b4c
commit 4e39432f4d
1 changed files with 31 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

47
drivers/pci/pci-acpi.c
View file

@ -120,14 +120,35 @@ out_kfree:
return status;
}
static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
{
acpi_status status;
u32 support_set;
struct acpi_osc_args osc_args;
/* do _OSC query for all possible controls */
support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
status = acpi_run_osc(osc_data->handle, &osc_args);
if (ACPI_SUCCESS(status)) {
osc_data->support_set = support_set;
osc_data->query_result = osc_args.query_result;
osc_data->is_queried = 1;
}
return status;
}
static acpi_status acpi_query_osc(acpi_handle handle,
u32 level, void *context, void **retval)
{
acpi_status status;
struct acpi_osc_data *osc_data;
u32 flags = (unsigned long)context, support_set;
u32 flags = (unsigned long)context;
acpi_handle tmp;
struct acpi_osc_args osc_args;
status = acpi_get_handle(handle, "_OSC", &tmp);
if (ACPI_FAILURE(status))
@ -141,18 +162,7 @@ static acpi_status acpi_query_osc(acpi_handle handle,
goto out;
}
/* do _OSC query for all possible controls */
support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
status = acpi_run_osc(handle, &osc_args);
if (ACPI_SUCCESS(status)) {
osc_data->support_set = support_set;
osc_data->query_result = osc_args.query_result;
osc_data->is_queried = 1;
}
status = __acpi_query_osc(flags, osc_data);
out:
mutex_unlock(&pci_acpi_lock);
return status;
@ -209,8 +219,13 @@ acpi_status pci_osc_control_set(acpi_handle handle, u32 flags)
goto out;
}
if (osc_data->is_queried &&
((osc_data->query_result & ctrlset) != ctrlset)) {
if (!osc_data->is_queried) {
status = __acpi_query_osc(osc_data->support_set, osc_data);
if (ACPI_FAILURE(status))
goto out;
}
if ((osc_data->query_result & ctrlset) != ctrlset) {
status = AE_SUPPORT;
goto out;
}