Index: sys/dev/pci/pci.c
===================================================================
--- sys/dev/pci/pci.c	(revision 273564)
+++ sys/dev/pci/pci.c	(working copy)
@@ -3651,7 +3651,7 @@
 	dinfo = device_get_ivars(child);
 	dstate = state;
 	if (device_is_attached(child) &&
-	    PCIB_POWER_FOR_SLEEP(pcib, dev, &dstate) == 0)
+	    PCIB_POWER_FOR_SLEEP(pcib, child, &dstate) == 0)
 		pci_set_powerstate(child, dstate);
 }