2 files changed, 42 insertions, 16 deletions

diff --git a/fs/char_dev.c b/fs/char_dev.c
index a173551e19d7..2f18c1e4e301 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -237,8 +237,10 @@ int alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count,
 }
 
 /**
- * register_chrdev() - Register a major number for character devices.
+ * __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
  *
@@ -254,19 +256,17 @@ int alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count,
  * /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.
- *
- * This function registers a range of 256 minor numbers. The first minor number
- * is 0.
  */
-int register_chrdev(unsigned int major, const char *name,
-                    const struct file_operations *fops)
+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;
         char *s;
         int err = -ENOMEM;
 
-        cd = __register_chrdev_region(major, 0, 256, name);
+        cd = __register_chrdev_region(major, baseminor, count, name);
         if (IS_ERR(cd))
                 return PTR_ERR(cd);
         
@@ -280,7 +280,7 @@ int register_chrdev(unsigned int major, const char *name,
         for (s = strchr(kobject_name(&cdev->kobj),'/'); s; s = strchr(s, '/'))
                 *s = '!';
                 
-        err = cdev_add(cdev, MKDEV(cd->major, 0), 256);
+        err = cdev_add(cdev, MKDEV(cd->major, baseminor), count);
         if (err)
                 goto out;
 
@@ -290,7 +290,7 @@ int register_chrdev(unsigned int major, const char *name,
 out:
         kobject_put(&cdev->kobj);
 out2:
-        kfree(__unregister_chrdev_region(cd->major, 0, 256));
+        kfree(__unregister_chrdev_region(cd->major, baseminor, count));
         return err;
 }
 
@@ -316,10 +316,23 @@ void unregister_chrdev_region(dev_t from, unsigned count)
         }
 }
 
-void unregister_chrdev(unsigned int major, const char *name)
+/**
+ * __unregister_chrdev - unregister and destroy a cdev
+ * @major: major device number
+ * @baseminor: first of the range of minor numbers
+ * @count: the number of minor numbers this cdev is occupying
+ * @name: name of this range of devices
+ *
+ * Unregister and destroy the cdev occupying the region described by
+ * @major, @baseminor and @count.  This function undoes what
+ * __register_chrdev() did.
+ */
+void __unregister_chrdev(unsigned int major, unsigned int baseminor,
+                         unsigned int count, const char *name)
 {
         struct char_device_struct *cd;
-        cd = __unregister_chrdev_region(major, 0, 256);
+
+        cd = __unregister_chrdev_region(major, baseminor, count);
         if (cd && cd->cdev)
                 cdev_del(cd->cdev);
         kfree(cd);
@@ -568,6 +581,6 @@ EXPORT_SYMBOL(cdev_alloc);
 EXPORT_SYMBOL(cdev_del);
 EXPORT_SYMBOL(cdev_add);
 EXPORT_SYMBOL(cdev_index);
-EXPORT_SYMBOL(register_chrdev);
-EXPORT_SYMBOL(unregister_chrdev);
+EXPORT_SYMBOL(__register_chrdev);
+EXPORT_SYMBOL(__unregister_chrdev);
 EXPORT_SYMBOL(directly_mappable_cdev_bdi);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index a36ffa5a77a4..6c36ab788854 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1998,12 +1998,25 @@ extern void bd_release_from_disk(struct block_device *, struct gendisk *);
 #define CHRDEV_MAJOR_HASH_SIZE  255
 extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *);
 extern int register_chrdev_region(dev_t, unsigned, const char *);
-extern int register_chrdev(unsigned int, const char *,
-                           const struct file_operations *);
-extern void unregister_chrdev(unsigned int, const char *);
+extern int __register_chrdev(unsigned int major, unsigned int baseminor,
+                             unsigned int count, const char *name,
+                             const struct file_operations *fops);
+extern void __unregister_chrdev(unsigned int major, unsigned int baseminor,
+                                unsigned int count, const char *name);
 extern void unregister_chrdev_region(dev_t, unsigned);
 extern void chrdev_show(struct seq_file *,off_t);
 
+static inline int register_chrdev(unsigned int major, const char *name,
+                                  const struct file_operations *fops)
+{
+        return __register_chrdev(major, 0, 256, name, fops);
+}
+
+static inline void unregister_chrdev(unsigned int major, const char *name)
+{
+        __unregister_chrdev(major, 0, 256, name);
+}
+
 /* fs/block_dev.c */
 #define BDEVNAME_SIZE   32      /* Largest string for a blockdev identifier */
 #define BDEVT_SIZE      10      /* Largest string for MAJ:MIN for blkdev */