ACPICA: take ACPI_MTX_INTERPRETER in acpi_unload_table_id()

acpi_tb_delete_namespace_by_owner() expects ACPI_MTX_INTERPRETER to be
taken. This fixes the following issue:

ACPI Error: Mutex [0x0] is not acquired, cannot release (20141107/utmutex-322)
Call Trace:
  [<ffffffff81b0bd28>] dump_stack+0x4f/0x7b
  [<ffffffff81546bfc>] acpi_ut_release_mutex+0x47/0x67
  [<ffffffff81542cf1>] acpi_tb_delete_namespace_by_owner+0x57/0x8d
  [<ffffffff81543ef1>] acpi_unload_table_id+0x3a/0x5e

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/tbxface.c b/drivers/acpi/acpica/tbxface.c
index 6482b0ded652..9520ae19bb37 100644
--- a/drivers/acpi/acpica/tbxface.c
+++ b/drivers/acpi/acpica/tbxface.c
@@ -281,6 +281,11 @@ acpi_status acpi_unload_table_id(acpi_owner_id id)
 
         ACPI_FUNCTION_TRACE(acpi_unload_table_id);
 
+        status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
         /* Find table in the global table list */
         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
                 if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
@@ -297,6 +302,8 @@ acpi_status acpi_unload_table_id(acpi_owner_id id)
                 acpi_tb_set_table_loaded_flag(i, FALSE);
                 break;
         }
+
+        (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
         return_ACPI_STATUS(status);
 }