ACPICA: Tables: Fix "UNLOAD" code path lock issues

ACPICA commit 39227380f5b99c51b897a3ffedd88508aa26789b

The previous lock fixes didn't cover "Unload" opcode and table unload APIs,
this patch fixes lock issues in the "Unload" code path. BZ 1325, Lv Zheng.

Link: https://github.com/acpica/acpica/commit/39227380
Link: https://bugs.acpica.org/show_bug.cgi?id=1325
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/tbxfload.c

@@ -378,9 +378,9 @@ acpi_status acpi_unload_parent_table(acpi_handle object)
 		return_ACPI_STATUS(AE_TYPE);
 	}
 
-	/* Must acquire the interpreter lock during this operation */
+	/* Must acquire the table lock during this operation */
 
-	status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
+	status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 	if (ACPI_FAILURE(status)) {
 		return_ACPI_STATUS(status);
 	}
@@ -407,8 +407,10 @@ acpi_status acpi_unload_parent_table(acpi_handle object)
 
 		/* Ensure the table is actually loaded */
 
+		(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 		if (!acpi_tb_is_table_loaded(i)) {
 			status = AE_NOT_EXIST;
+			(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 			break;
 		}
 
@@ -434,10 +436,11 @@ acpi_status acpi_unload_parent_table(acpi_handle object)
 
 		status = acpi_tb_release_owner_id(i);
 		acpi_tb_set_table_loaded_flag(i, FALSE);
+		(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 		break;
 	}
 
-	(void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
+	(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 	return_ACPI_STATUS(status);
 }