[PATCH] add class_device to miscdevice

Currently misc_register() throws away the return from
class_simple_device_add().  This makes it impossible to get to the
class_device of the directories in /sys/class/misc and, for example,
thus impossible to add attributes to those directories.

Attached patch adds a class_device structure to the miscdevice structure
and assigns to it the value returned from class_simple_device_add() in
misc_register(), thus caching the value and allowing us to f.e. later
call class_device_create_file().

We need this for inotify, but I can see plenty of other misc. devices
wanting this and consider it missing but required functionality.


Add the class_device structure to miscdevice so that we can add sysfs
attributes to /sys/class/misc/foo

Signed-Off-By: Robert Love <rml@novell.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 209f6ffbd588..56fe7347f921 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -2,6 +2,7 @@
 #define _LINUX_MISCDEVICE_H
 #include <linux/module.h>
 #include <linux/major.h>
+#include <linux/device.h>
 
 #define PSMOUSE_MINOR  1
 #define MS_BUSMOUSE_MINOR 2
@@ -32,13 +33,13 @@
 
 struct device;
 
-struct miscdevice 
-{
+struct miscdevice  {
 	int minor;
 	const char *name;
 	struct file_operations *fops;
 	struct list_head list;
 	struct device *dev;
+	struct class_device *class;
 	char devfs_name[64];
 };