PCI / ACPI: Use acpi_find_child_device() for child devices lookup
It is much more efficient to use acpi_find_child_device()
for child devices lookup in acpi_pci_find_device() and pass
ACPI_COMPANION(dev->parent) to it directly instead of obtaining
ACPI_HANDLE() of ACPI_COMPANION(dev->parent) and passing it to
acpi_find_child() which has to run acpi_bus_get_device() to
obtain ACPI_COMPANION(dev->parent) from that again.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Aaron Lu <aaron.lu@intel.com>
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index ea77512..9d200d5 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -106,6 +106,9 @@
struct acpi_device *adev, *ret = NULL;
int ret_score = 0;
+ if (!parent)
+ return NULL;
+
list_for_each_entry(adev, &parent->children, node) {
unsigned long long addr;
acpi_status status;