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Commit cd4faf9c authored by Taku Izumi's avatar Taku Izumi Committed by Bjorn Helgaas
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PCI/ACPI: Use acpi_driver_data() rather than searching acpi_pci_roots 



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: default avatarTaku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 6507e6eb

drivers/acpi/pci_root.c

+8 −5
Original line number Diff line number Diff line
@@ -270,12 +270,15 @@ static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) 
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;

	}

	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);