[PATCH] acpiphp: Scan slots under the nested P2P bridge

Current ACPIPHP driver scans only slots under the top level PCI-to-PCI
bridge. So hotplug PCI slots under the nested PCI-to-PCI bridge would
not be detected. For example, if the system has the ACPI namespace
like below, hotplug slots woule not be detected.

Device (PCI0) { /* Root bridge */
Name (_HID, "PNP0A03")
Device (P2PA) { /* PCI-to-PCI bridge */
Name (_ADR, ...)
Device (P2PB) { /* PCI-to-PCI bridge */
Name (_ADR, ...)
Device (S0F0) { /* hotplug slot */
Name (_ADR, ...)
Name (_SUN, ...)
Method (_EJ0, ...) { ... }
}
...
Device (S0F7) { /* hotplug slot */
Name (_ADR, ...)
Name (_SUN, ...)
Method (_EJ0, ...) { ... }
}
Device (S1F0) { /* hotplug slot */
Name (_ADR, ...)
Name (_SUN, ...)
Method (_EJ0, ...) { ... }
}
...
}
}
}

This patch fixes this issue.

Signed-off-by: Kenji Kaneshige <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/pci/hotplug/acpiphp_glue.c

···
 		add_p2p_bridge(handle, dev);
 	}
 
+	/* search P2P bridges under this p2p bridge */
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1,
+				     find_p2p_bridge, dev->subordinate, NULL);
+	if (ACPI_FAILURE(status))
+		warn("find_p2p_bridge faied (error code = 0x%x)\n", status);
+
  out:
 	pci_dev_put(dev);
 	return AE_OK;
···
 	} else {
 		/* clean-up p2p bridges under this host bridge */
 		acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
-				(u32)1, cleanup_p2p_bridge, NULL, NULL);
+				    ACPI_UINT32_MAX, cleanup_p2p_bridge,
+				    NULL, NULL);
 	}
 }