lib/of-reconfig-notifier-error-inject.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 #include <linux/kernel.h>
   3 #include <linux/module.h>
   4 #include <linux/of.h>
   5
   6 #include "notifier-error-inject.h"
   7
   8 static int priority;
   9 module_param(priority, int, 0);
  10 MODULE_PARM_DESC(priority, "specify OF reconfig notifier priority");
  11
  12 static struct notifier_err_inject reconfig_err_inject = {
  13         .actions = {
  14                 { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_ATTACH_NODE) },
  15                 { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_DETACH_NODE) },
  16                 { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_ADD_PROPERTY) },
  17                 { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_REMOVE_PROPERTY) },
  18                 { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_UPDATE_PROPERTY) },
  19                 {}
  20         }
  21 };
  22
  23 static struct dentry *dir;
  24
  25 static int err_inject_init(void)
  26 {
  27         int err;
  28
  29         dir = notifier_err_inject_init("OF-reconfig",
  30                 notifier_err_inject_dir, &reconfig_err_inject, priority);
  31         if (IS_ERR(dir))
  32                 return PTR_ERR(dir);
  33
  34         err = of_reconfig_notifier_register(&reconfig_err_inject.nb);
  35         if (err)
  36                 debugfs_remove_recursive(dir);
  37
  38         return err;
  39 }
  40
  41 static void err_inject_exit(void)
  42 {
  43         of_reconfig_notifier_unregister(&reconfig_err_inject.nb);
  44         debugfs_remove_recursive(dir);
  45 }
  46
  47 module_init(err_inject_init);
  48 module_exit(err_inject_exit);
  49
  50 MODULE_DESCRIPTION("OF reconfig notifier error injection module");
  51 MODULE_LICENSE("GPL");
  52 MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");