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path: root/drivers/hv/vmbus_drv.c
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Diffstat (limited to 'drivers/hv/vmbus_drv.c')
-rw-r--r--drivers/hv/vmbus_drv.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 67f95a29aeca..edbb38f6956b 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -2287,7 +2287,8 @@ static int vmbus_acpi_add(struct platform_device *pdev)
* Some ancestor of the vmbus acpi device (Gen1 or Gen2
* firmware) is the VMOD that has the mmio ranges. Get that.
*/
- for (ancestor = acpi_dev_parent(device); ancestor;
+ for (ancestor = acpi_dev_parent(device);
+ ancestor && ancestor->handle != ACPI_ROOT_OBJECT;
ancestor = acpi_dev_parent(ancestor)) {
result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS,
vmbus_walk_resources, NULL);