target/linux/ipq806x/patches-4.4/009-3-watchdog-Use-static-struct-class-watchdog_class-instead-of-pointer.patch

   1 From 906d7a5cfeda508e7361f021605579a00cd82815 Mon Sep 17 00:00:00 2001
   2 From: Pratyush Anand <panand@redhat.com>
   3 Date: Thu, 17 Dec 2015 17:53:58 +0530
   4 Subject: watchdog: Use static struct class watchdog_class in stead of pointer
   5
   6 We need few sysfs attributes to know different status of a watchdog device.
   7 To do that, we need to associate .dev_groups with watchdog_class. So
   8 convert it from pointer to static.
   9 Putting this static struct in watchdog_dev.c, so that static device
  10 attributes defined in that file can be attached to it.
  11
  12 Signed-off-by: Pratyush Anand <panand@redhat.com>
  13 Suggested-by: Guenter Roeck <linux@roeck-us.net>
  14 Reviewed-by: Guenter Roeck <linux@roeck-us.net>
  15 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
  16 Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
  17 ---
  18  drivers/watchdog/watchdog_core.c | 15 ++-------------
  19  drivers/watchdog/watchdog_core.h |  2 +-
  20  drivers/watchdog/watchdog_dev.c  | 26 ++++++++++++++++++++++----
  21  3 files changed, 25 insertions(+), 18 deletions(-)
  22
  23 --- a/drivers/watchdog/watchdog_core.c
  24 +++ b/drivers/watchdog/watchdog_core.c
  25 @@ -370,19 +370,9 @@ static int __init watchdog_deferred_regi
  26
  27  static int __init watchdog_init(void)
  28  {
  29 -       int err;
  30 -
  31 -       watchdog_class = class_create(THIS_MODULE, "watchdog");
  32 -       if (IS_ERR(watchdog_class)) {
  33 -               pr_err("couldn't create class\n");
  34 +       watchdog_class = watchdog_dev_init();
  35 +       if (IS_ERR(watchdog_class))
  36                 return PTR_ERR(watchdog_class);
  37 -       }
  38 -
  39 -       err = watchdog_dev_init();
  40 -       if (err < 0) {
  41 -               class_destroy(watchdog_class);
  42 -               return err;
  43 -       }
  44
  45         watchdog_deferred_registration();
  46         return 0;
  47 @@ -391,7 +381,6 @@ static int __init watchdog_init(void)
  48  static void __exit watchdog_exit(void)
  49  {
  50         watchdog_dev_exit();
  51 -       class_destroy(watchdog_class);
  52         ida_destroy(&watchdog_ida);
  53  }
  54
  55 --- a/drivers/watchdog/watchdog_core.h
  56 +++ b/drivers/watchdog/watchdog_core.h
  57 @@ -33,5 +33,5 @@
  58   */
  59  extern int watchdog_dev_register(struct watchdog_device *);
  60  extern int watchdog_dev_unregister(struct watchdog_device *);
  61 -extern int __init watchdog_dev_init(void);
  62 +extern struct class * __init watchdog_dev_init(void);
  63  extern void __exit watchdog_dev_exit(void);
  64 --- a/drivers/watchdog/watchdog_dev.c
  65 +++ b/drivers/watchdog/watchdog_dev.c
  66 @@ -581,18 +581,35 @@ int watchdog_dev_unregister(struct watch
  67         return 0;
  68  }
  69
  70 +static struct class watchdog_class = {
  71 +       .name =         "watchdog",
  72 +       .owner =        THIS_MODULE,
  73 +};
  74 +
  75  /*
  76   *     watchdog_dev_init: init dev part of watchdog core
  77   *
  78   *     Allocate a range of chardev nodes to use for watchdog devices
  79   */
  80
  81 -int __init watchdog_dev_init(void)
  82 +struct class * __init watchdog_dev_init(void)
  83  {
  84 -       int err = alloc_chrdev_region(&watchdog_devt, 0, MAX_DOGS, "watchdog");
  85 -       if (err < 0)
  86 +       int err;
  87 +
  88 +       err = class_register(&watchdog_class);
  89 +       if (err < 0) {
  90 +               pr_err("couldn't register class\n");
  91 +               return ERR_PTR(err);
  92 +       }
  93 +
  94 +       err = alloc_chrdev_region(&watchdog_devt, 0, MAX_DOGS, "watchdog");
  95 +       if (err < 0) {
  96                 pr_err("watchdog: unable to allocate char dev region\n");
  97 -       return err;
  98 +               class_unregister(&watchdog_class);
  99 +               return ERR_PTR(err);
 100 +       }
 101 +
 102 +       return &watchdog_class;
 103  }
 104
 105  /*
 106 @@ -604,4 +621,5 @@ int __init watchdog_dev_init(void)
 107  void __exit watchdog_dev_exit(void)
 108  {
 109         unregister_chrdev_region(watchdog_devt, MAX_DOGS);
 110 +       class_unregister(&watchdog_class);
 111  }