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-rw-r--r--drivers/pci/hotplug/acpiphp_glue.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 803d9ddd6e7..a33794d9e0d 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/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);