diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
index a56ca080e108f20e6680bc774f4fb7eb680edf21..c3ab46da51a35da4bfb5a6965a02e4c5d8c96401 100644
--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -285,18 +285,22 @@ int agp_add_bridge(struct agp_bridge_data *bridge)
 {
 	int error;
 
-	if (agp_off)
-		return -ENODEV;
+	if (agp_off) {
+		error = -ENODEV;
+		goto err_put_bridge;
+	}
 
 	if (!bridge->dev) {
 		printk (KERN_DEBUG PFX "Erk, registering with no pci_dev!\n");
-		return -EINVAL;
+		error = -EINVAL;
+		goto err_put_bridge;
 	}
 
 	/* Grab reference on the chipset driver. */
 	if (!try_module_get(bridge->driver->owner)) {
 		dev_info(&bridge->dev->dev, "can't lock chipset driver\n");
-		return -EINVAL;
+		error = -EINVAL;
+		goto err_put_bridge;
 	}
 
 	error = agp_backend_initialize(bridge);
@@ -326,6 +330,7 @@ frontend_err:
 	agp_backend_cleanup(bridge);
 err_out:
 	module_put(bridge->driver->owner);
+err_put_bridge:
 	agp_put_bridge(bridge);
 	return error;
 }
diff --git a/drivers/char/agp/hp-agp.c b/drivers/char/agp/hp-agp.c
index 9047b2714653c54ef3c0130f30e09cd98e0bc534..58752b70efead7a76ca65c1441574dfa50931a07 100644
--- a/drivers/char/agp/hp-agp.c
+++ b/drivers/char/agp/hp-agp.c
@@ -488,9 +488,8 @@ zx1_gart_probe (acpi_handle obj, u32 depth, void *context, void **ret)
 	handle = obj;
 	do {
 		status = acpi_get_object_info(handle, &info);
-		if (ACPI_SUCCESS(status)) {
+		if (ACPI_SUCCESS(status) && (info->valid & ACPI_VALID_HID)) {
 			/* TBD check _CID also */
-			info->hardware_id.string[sizeof(info->hardware_id.length)-1] = '\0';
 			match = (strcmp(info->hardware_id.string, "HWP0001") == 0);
 			kfree(info);
 			if (match) {
@@ -509,6 +508,9 @@ zx1_gart_probe (acpi_handle obj, u32 depth, void *context, void **ret)
 		handle = parent;
 	} while (ACPI_SUCCESS(status));
 
+	if (ACPI_FAILURE(status))
+		return AE_OK;	/* found no enclosing IOC */
+
 	if (hp_zx1_setup(sba_hpa + HP_ZX1_IOC_OFFSET, lba_hpa))
 		return AE_OK;