---

yaml
---
r: 142755
b: refs/heads/master
c: 5d4a4b2
h: refs/heads/master
i:
  142753: 1ed2f07
  142751: 50fd761
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c2ac7cdc6707a8a3fc5cdaebb65cb724ba8ecdef
+refs/heads/master: 5d4a4b25ddc3e864d3a562c024bebdc922118854

trunk/drivers/pci/hotplug/acpiphp_glue.c

@@ -38,6 +38,8 @@
  *  - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
  *    when the bridge is scanned and it loses a refcount when the bridge
  *    is removed.
+ *  - When a P2P bridge is present, we elevate the refcount on the subordinate
+ *    bus. It loses the refcount when the the driver unloads.
  */
 
 #include <linux/init.h>
@@ -440,6 +442,12 @@ static void add_p2p_bridge(acpi_handle *handle, struct pci_dev *pci_dev)
 		goto err;
 	}
 
+	/*
+	 * Grab a ref to the subordinate PCI bus in case the bus is
+	 * removed via PCI core logical hotplug. The ref pins the bus
+	 * (which we access during module unload).
+	 */
+	get_device(&bridge->pci_bus->dev);
 	spin_lock_init(&bridge->res_lock);
 
 	init_bridge_misc(bridge);
@@ -619,6 +627,12 @@ static void cleanup_bridge(struct acpiphp_bridge *bridge)
 		slot = next;
 	}
 
+	/*
+	 * Only P2P bridges have a pci_dev
+	 */
+	if (bridge->pci_dev)
+		put_device(&bridge->pci_bus->dev);
+
 	pci_dev_put(bridge->pci_dev);
 	list_del(&bridge->list);
 	kfree(bridge);