ACPI / button: remove pointer to old lid_sysfs on unbind

When we removed the procfs dir on error or if the driver is
unbound, the two variables acpi_lid_dir and acpi_button_dir
were not reset. On the next rebind, those static variables
were not null and we couldn't re-register the device again.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 148f4e5ca104..31abb0bdd4f2 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -232,8 +232,10 @@ remove_dev_dir:
         acpi_device_dir(device) = NULL;
 remove_lid_dir:
         remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+        acpi_lid_dir = NULL;
 remove_button_dir:
         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+        acpi_button_dir = NULL;
         goto done;
 }
 
@@ -250,7 +252,9 @@ static int acpi_button_remove_fs(struct acpi_device *device)
                           acpi_lid_dir);
         acpi_device_dir(device) = NULL;
         remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
+        acpi_lid_dir = NULL;
         remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
+        acpi_button_dir = NULL;
 
         return 0;
 }