drivers/s390/s390_rdev.c

   1 /*
   2  *  drivers/s390/s390_rdev.c
   3  *  s390 root device
   4  *
   5  *    Copyright (C) 2002, 2005 IBM Deutschland Entwicklung GmbH,
   6  *                       IBM Corporation
   7  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
   8  *                Carsten Otte  (cotte@de.ibm.com)
   9  */
  10
  11 #include <linux/slab.h>
  12 #include <linux/err.h>
  13 #include <linux/device.h>
  14 #include <asm/s390_rdev.h>
  15
  16 static void
  17 s390_root_dev_release(struct device *dev)
  18 {
  19         kfree(dev);
  20 }
  21
  22 struct device *
  23 s390_root_dev_register(const char *name)
  24 {
  25         struct device *dev;
  26         int ret;
  27
  28         if (!strlen(name))
  29                 return ERR_PTR(-EINVAL);
  30         dev = kzalloc(sizeof(struct device), GFP_KERNEL);
  31         if (!dev)
  32                 return ERR_PTR(-ENOMEM);
  33         strncpy(dev->bus_id, name, min(strlen(name), (size_t)BUS_ID_SIZE));
  34         dev->release = s390_root_dev_release;
  35         ret = device_register(dev);
  36         if (ret) {
  37                 kfree(dev);
  38                 return ERR_PTR(ret);
  39         }
  40         return dev;
  41 }
  42
  43 void
  44 s390_root_dev_unregister(struct device *dev)
  45 {
  46         if (dev)
  47                 device_unregister(dev);
  48 }
  49
  50 EXPORT_SYMBOL(s390_root_dev_register);
  51 EXPORT_SYMBOL(s390_root_dev_unregister);