git.openwrt.org Git - openwrt/staging/chunkeey.git/blob

   1 From 43f676ace2e0591718ff493d290bc49b35ec2ffc Mon Sep 17 00:00:00 2001
   2 From: Guenter Roeck <linux@roeck-us.net>
   3 Date: Fri, 25 Dec 2015 16:01:44 -0800
   4 Subject: watchdog: da9055_wdt: Drop reference counting
   5
   6 Reference counting is now implemented in the watchdog core and no longer
   7 required in watchdog drivers.
   8
   9 Since it was implememented a no-op, and since the local memory is allocated
  10 with devm_kzalloc(), the reference counting code in the driver really did
  11 not really work anyway, and this patch effectively fixes a bug which could
  12 cause a crash on unloading if the watchdog device was still open.
  13
  14 Signed-off-by: Guenter Roeck <linux@roeck-us.net>
  15 Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
  16 ---
  17  drivers/watchdog/da9055_wdt.c | 24 ------------------------
  18  1 file changed, 24 deletions(-)
  19
  20 --- a/drivers/watchdog/da9055_wdt.c
  21 +++ b/drivers/watchdog/da9055_wdt.c
  22 @@ -35,7 +35,6 @@ MODULE_PARM_DESC(nowayout,
  23  struct da9055_wdt_data {
  24         struct watchdog_device wdt;
  25         struct da9055 *da9055;
  26 -       struct kref kref;
  27  };
  28
  29  static const struct {
  30 @@ -99,24 +98,6 @@ static int da9055_wdt_ping(struct watchd
  31                                  DA9055_WATCHDOG_MASK, 1);
  32  }
  33
  34 -static void da9055_wdt_release_resources(struct kref *r)
  35 -{
  36 -}
  37 -
  38 -static void da9055_wdt_ref(struct watchdog_device *wdt_dev)
  39 -{
  40 -       struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
  41 -
  42 -       kref_get(&driver_data->kref);
  43 -}
  44 -
  45 -static void da9055_wdt_unref(struct watchdog_device *wdt_dev)
  46 -{
  47 -       struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
  48 -
  49 -       kref_put(&driver_data->kref, da9055_wdt_release_resources);
  50 -}
  51 -
  52  static int da9055_wdt_start(struct watchdog_device *wdt_dev)
  53  {
  54         return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
  55 @@ -138,8 +119,6 @@ static const struct watchdog_ops da9055_
  56         .stop = da9055_wdt_stop,
  57         .ping = da9055_wdt_ping,
  58         .set_timeout = da9055_wdt_set_timeout,
  59 -       .ref = da9055_wdt_ref,
  60 -       .unref = da9055_wdt_unref,
  61  };
  62
  63  static int da9055_wdt_probe(struct platform_device *pdev)
  64 @@ -165,8 +144,6 @@ static int da9055_wdt_probe(struct platf
  65         watchdog_set_nowayout(da9055_wdt, nowayout);
  66         watchdog_set_drvdata(da9055_wdt, driver_data);
  67
  68 -       kref_init(&driver_data->kref);
  69 -
  70         ret = da9055_wdt_stop(da9055_wdt);
  71         if (ret < 0) {
  72                 dev_err(&pdev->dev, "Failed to stop watchdog, %d\n", ret);
  73 @@ -189,7 +166,6 @@ static int da9055_wdt_remove(struct plat
  74         struct da9055_wdt_data *driver_data = platform_get_drvdata(pdev);
  75
  76         watchdog_unregister_device(&driver_data->wdt);
  77 -       kref_put(&driver_data->kref, da9055_wdt_release_resources);
  78
  79         return 0;
  80  }