diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index b1c0c70..194f1d2 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -265,6 +265,13 @@
 	}
 
 	/*
+	 * If the device is still on, set the power state as "unknown",
+	 * since it might change by the next time we load the driver.
+	 */
+	if (pci_dev->current_state == PCI_D0)
+		pci_dev->current_state = PCI_UNKNOWN;
+
+	/*
 	 * We would love to complain here if pci_dev->is_enabled is set, that
 	 * the driver should have called pci_disable_device(), but the
 	 * unfortunate fact is there are too many odd BIOS and bridge setups
@@ -288,6 +295,12 @@
 		suspend_report_result(drv->suspend, i);
 	} else {
 		pci_save_state(pci_dev);
+		/*
+		 * mark its power state as "unknown", since we don't know if
+		 * e.g. the BIOS will change its device state when we suspend.
+		 */
+		if (pci_dev->current_state == PCI_D0)
+			pci_dev->current_state = PCI_UNKNOWN;
 	}
 	return i;
 }