linux-4.4.1/__register_chrdev() の変更点

• 追加された行はこの色です。
• 削除された行はこの色です。
• linux-4.4.1/__register_chrdev() へ行く。
• linux-4.4.1/__register_chrdev() の差分を削除

*参照元 [#q45d85cf]
#backlinks

*説明 [#we3e1abe]
-パス: [[linux-4.4.1/fs/char_dev.c]]

-FIXME: これは何？
--説明


**引数 [#ta6e64a9]
-unsigned int major
--
-unsigned int baseminor
--
-unsigned int count
--
-const char *name
--
-const struct file_operations *fops
--
--[[linux-4.4.1/file_operations]]


**返り値 [#a307ffb7]
-int
--

**参考 [#adf5c706]


*実装 [#c7f0595f]
 /**
  * __register_chrdev() - create and register a cdev occupying a range of minors
  * @major: major device number or 0 for dynamic allocation
  * @baseminor: first of the requested range of minor numbers
  * @count: the number of minor numbers required
  * @name: name of this range of devices
  * @fops: file operations associated with this devices
  *
  * If @major == 0 this functions will dynamically allocate a major and return
  * its number.
  *
  * If @major > 0 this function will attempt to reserve a device with the given
  * major number and will return zero on success.
  *
  * Returns a -ve errno on failure.
  *
  * The name of this device has nothing to do with the name of the device in
  * /dev. It only helps to keep track of the different owners of devices. If
  * your module name has only one type of devices it's ok to use e.g. the name
  * of the module here.
  */
 int __register_chrdev(unsigned int major, unsigned int baseminor,
                       unsigned int count, const char *name,
                       const struct file_operations *fops)
 {
         struct char_device_struct *cd;
         struct cdev *cdev;
         int err = -ENOMEM;
 
-
--[[linux-4.4.1/char_device_struct]]
--[[linux-4.4.1/cdev]]

         cd = __register_chrdev_region(major, baseminor, count, name);
         if (IS_ERR(cd))
                 return PTR_ERR(cd);
 
-
--[[linux-4.4.1/__register_chrdev_region()]]
--[[linux-4.4.1/IS_ERR()]]
--[[linux-4.4.1/PTR_ERR()]]

         cdev = cdev_alloc();
         if (!cdev)
                 goto out2;
 
-
--[[linux-4.4.1/cdev_alloc()]]

         cdev->owner = fops->owner;
         cdev->ops = fops;
         kobject_set_name(&cdev->kobj, "%s", name);
 
-
--[[linux-4.4.1/kobject_set_name()]]

         err = cdev_add(cdev, MKDEV(cd->major, baseminor), count);
         if (err)
                 goto out;
 
-
--[[linux-4.4.1/cdev_add()]]
--[[linux-4.4.1/MKDEV()]]

         cd->cdev = cdev;
 
         return major ? 0 : cd->major;
 out:
         kobject_put(&cdev->kobj);
-
--[[linux-4.4.1/kobject_put()]]

 out2:
         kfree(__unregister_chrdev_region(cd->major, baseminor, count));
         return err;
-
--[[linux-4.4.1/kfree()]]
--[[linux-4.4.1/__unregister_chrdev_region()]]

 }


*コメント [#a2039537]