This patch changes the implementation of acpi_pci_find_root().
We can access acpi_pci_root without scanning acpi_pci_roots list.
If hostbridge hotplug is supported, acpi_pci_roots list will be
protected by mutex. We should not access acpi_pci_roots list
if preventable to lessen deadlock risk.
Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
---
drivers/acpi/pci_root.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
Index: Bjorn-next-0903/drivers/acpi/pci_root.c
===================================================================
--- Bjorn-next-0903.orig/drivers/acpi/pci_root.c
+++ Bjorn-next-0903/drivers/acpi/pci_root.c
@@ -265,12 +265,15 @@ static acpi_status acpi_pci_osc_support(
struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
{
struct acpi_pci_root *root;
+ struct acpi_device *device;
- list_for_each_entry(root, &acpi_pci_roots, node) {
- if (root->device->handle == handle)
- return root;
- }
- return NULL;
+ if (acpi_bus_get_device(handle, &device) ||
+ acpi_match_device_ids(device, root_device_ids))
+ return NULL;
+
+ root = acpi_driver_data(device);
+
+ return root;
}
EXPORT_SYMBOL_GPL(acpi_pci_find_root);
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