(2010/08/04 14:46), Kenji Kaneshige wrote:
> (2010/08/04 6:02), Rafael J. Wysocki wrote:
>> On Tuesday, August 03, 2010, Rafael J. Wysocki wrote:
>>> On Tuesday, August 03, 2010, Hidetoshi Seto wrote:
>>>> (2010/08/03 13:52), Kenji Kaneshige wrote:
>>>>> (2010/08/03 6:59), Rafael J. Wysocki wrote:
>>>>>> @@ -434,19 +432,6 @@ acpi_status acpi_pci_osc_control_set(acp
>>>>>> if ((root->osc_control_set& control_req) == control_req)
>>>>>> goto out;
>>>>>>
>>>>>> - /* Need to query controls first before requesting them */
>>>>>> - if (!root->osc_queried) {
>>>>>> - status = acpi_pci_query_osc(root, root->osc_support_set, NULL);
>>>>>> - if (ACPI_FAILURE(status))
>>>>>> - goto out;
>>>>>> - }
>>>>>> - if ((root->osc_control_qry& control_req) != control_req) {
>>>>>> - printk(KERN_DEBUG
>>>>>> - "Firmware did not grant requested _OSC control\n");
>>>>>> - status = AE_SUPPORT;
>>>>>> - goto out;
>>>>>> - }
>>>>>
>>>>> I think acpi_pci_osc_control_set() still need to query before commit
>>>>> to ensure all the requested controls are granted to OS.
>>>>>
>>>>> So the code needs to be
>>>>>
>>>>> status = acpi_pci_query_osc(root, root->osc_support_set,&control_req);
>>>>> if (ACPI_FAILURE(status))
>>>>> goto out;
>>>>
>
> Sorry, that should have been
>
> query = control_req;
> status = acpi_pci_query_osc(root, root->osc_support_set, &query);
> if (ACPI_FAILURE(status))
> goto out;
> if ((query & control_req) != control_req) {
> printk_(KERN_DEBUG
> "Firmware did not grant requested _OSC control\n");
> status = AE_SUPPORT;
> goto out;
> }
>
> I know current pcie_port_acpi_setup() queries the requesting controls
> before acpi_pci_osc_control_set() and only one control is requested
> in the other code. However, I think acpi_pci_osc_control_set() still
> need to query the requested controls to ensure all the requested
> controls, in case someone calls this function without querying the
> requesting controls. In other words, I think it must be ensured that
> any controls are never granted to OS when acpi_pci_osc_control_set()
> returns error.
I think the following patch is what you mean.
And... (Continue to next post)
Thanks,
H.Seto
=====
From: Rafael J. Wysocki <rjw@xxxxxxx>
Subject: ACPI / PCI: Do not preserve _OSC control bits returned by a query (v3)
All of the remaining callers of acpi_pci_osc_control_set() either
use acpi_pci_root_osc_query() right before it, like
pcie_port_acpi_setup(), or ask for control of one feature only,
like acpi_get_hp_hw_control_from_firmware(). Thus there is no
reason to preserve the _OSC control bits returned by an _OSC query
and the osc_control_qry and osc_queried fields of struct
acpi_pci_root are not necessary any more. Remove them and modify the
code that uses them accordingly.
[v3: HS: keep query in acpi_pci_osc_control_set]
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
---
drivers/acpi/pci_root.c | 13 +++++--------
include/acpi/acpi_bus.h | 3 ---
2 files changed, 5 insertions(+), 11 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index d3110d6..ec03c19 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -248,10 +248,8 @@ static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
if (ACPI_SUCCESS(status)) {
root->osc_support_set = support;
- root->osc_control_qry = result;
if (control)
*control = result;
- root->osc_queried = 1;
}
return status;
}
@@ -438,12 +436,11 @@ acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 flags)
goto out;
/* Need to query controls first before requesting them */
- if (!root->osc_queried) {
- status = acpi_pci_query_osc(root, root->osc_support_set, NULL);
- if (ACPI_FAILURE(status))
- goto out;
- }
- if ((root->osc_control_qry & control_req) != control_req) {
+ result = control_req;
+ status = acpi_pci_query_osc(root, root->osc_support_set, &result);
+ if (ACPI_FAILURE(status))
+ goto out;
+ if ((result & control_req) != control_req) {
printk(KERN_DEBUG
"Firmware did not grant requested _OSC control\n");
status = AE_SUPPORT;
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index baacd98..4de84ce 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -377,9 +377,6 @@ struct acpi_pci_root {
u32 osc_support_set; /* _OSC state of support bits */
u32 osc_control_set; /* _OSC state of control bits */
- u32 osc_control_qry; /* the latest _OSC query result */
-
- u32 osc_queried:1; /* has _OSC control been queried? */
};
/* helper */
--
1.7.2
_______________________________________________
linux-pm mailing list
linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/linux-pm
