1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
index ae606b3e991e..574421bc2fa6 100644
--- a/drivers/pci/hotplug/sgi_hotplug.c
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -425,6 +425,7 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
                         pdevice = NULL;
                 }
 
+                acpi_scan_lock_acquire();
                 /*
                  * Walk the rootbus node's immediate children looking for
                  * the slot's device node(s). There can be more than
@@ -458,6 +459,7 @@ static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
                                 }
                         }
                 }
+                acpi_scan_lock_release();
         }
 
         /* Call the driver for the new device */
@@ -508,6 +510,7 @@ static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
                 /* Get the rootbus node pointer */
                 phandle = PCI_CONTROLLER(slot->pci_bus)->acpi_handle;
 
+                acpi_scan_lock_acquire();
                 /*
                  * Walk the rootbus node's immediate children looking for
                  * the slot's device node(s). There can be more than
@@ -538,7 +541,7 @@ static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
                                         acpi_bus_trim(device);
                         }
                 }
-
+                acpi_scan_lock_release();
         }
 
         /* Free the SN resources assigned to the Linux device.*/