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PCI: shpchp: Rely on previous _OSC results 

If _OSC exists, we evaluated it when adding the ACPI host bridge, and we
requested SHPC control if the SHPC driver is present.  Use the result of
that _OSC evaluation instead of evaluating it again.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[bhelgaas: split to separate patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Mika Westerberg 2018-05-24 14:45:55 -05:00 committed by Bjorn Helgaas
parent 1df81a6d6e
commit aa6be07c27
1 changed files with 10 additions and 19 deletions
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29
drivers/pci/hotplug/acpi_pcihp.c
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@ -69,16 +69,12 @@ static acpi_status acpi_run_oshp(acpi_handle handle)
*/
int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags)
{
const struct pci_host_bridge *host;
const struct acpi_pci_root *root;
acpi_status status;
acpi_handle chandle, handle;
struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
flags &= OSC_PCI_SHPC_NATIVE_HP_CONTROL;
if (!flags) {
err("Invalid flags %u specified!\n", flags);
return -EINVAL;
}
/*
* Per PCI firmware specification, we should run the ACPI _OSC
* method to get control of hotplug hardware before using it. If
@ -88,19 +84,14 @@ int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags)
* OSHP within the scope of the hotplug controller and its parents,
* up to the host bridge under which this controller exists.
*/
handle = acpi_find_root_bridge_handle(pdev);
if (handle) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
dbg("Trying to get hotplug control for %s\n",
(char *)string.pointer);
status = acpi_pci_osc_control_set(handle, &flags, flags);
if (ACPI_SUCCESS(status))
goto got_one;
if (status == AE_SUPPORT)
goto no_control;
kfree(string.pointer);
string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL };
}
host = pci_find_host_bridge(pdev->bus);
if (host->native_shpc_hotplug)
return 0;
/* If _OSC exists, we should not evaluate OSHP */
root = acpi_pci_find_root(ACPI_HANDLE(&host->dev));
if (root->osc_support_set)
goto no_control;
handle = ACPI_HANDLE(&pdev->dev);
if (!handle) {