1 files changed, 10 insertions, 53 deletions

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 387a63662793..8acf82bba44c 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -20,43 +20,6 @@
 
 #include "sysfs.h"
 
-#define to_sattr(a) container_of(a,struct subsys_attribute, attr)
-
-/*
- * Subsystem file operations.
- * These operations allow subsystems to have files that can be 
- * read/written. 
- */
-static ssize_t 
-subsys_attr_show(struct kobject * kobj, struct attribute * attr, char * page)
-{
-        struct kset *kset = to_kset(kobj);
-        struct subsys_attribute * sattr = to_sattr(attr);
-        ssize_t ret = -EIO;
-
-        if (sattr->show)
-                ret = sattr->show(kset, page);
-        return ret;
-}
-
-static ssize_t 
-subsys_attr_store(struct kobject * kobj, struct attribute * attr, 
-                  const char * page, size_t count)
-{
-        struct kset *kset = to_kset(kobj);
-        struct subsys_attribute * sattr = to_sattr(attr);
-        ssize_t ret = -EIO;
-
-        if (sattr->store)
-                ret = sattr->store(kset, page, count);
-        return ret;
-}
-
-static struct sysfs_ops subsys_sysfs_ops = {
-        .show   = subsys_attr_show,
-        .store  = subsys_attr_store,
-};
-
 /*
  * There's one sysfs_buffer for each open file and one
  * sysfs_open_dirent for each sysfs_dirent with one or more open
@@ -354,29 +317,23 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 {
         struct sysfs_dirent *attr_sd = file->f_path.dentry->d_fsdata;
         struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;
-        struct sysfs_buffer * buffer;
-        struct sysfs_ops * ops = NULL;
-        int error;
+        struct sysfs_buffer *buffer;
+        struct sysfs_ops *ops;
+        int error = -EACCES;
 
         /* need attr_sd for attr and ops, its parent for kobj */
         if (!sysfs_get_active_two(attr_sd))
                 return -ENODEV;
 
-        /* if the kobject has no ktype, then we assume that it is a subsystem
-         * itself, and use ops for it.
-         */
-        if (kobj->ktype)
+        /* every kobject with an attribute needs a ktype assigned */
+        if (kobj->ktype && kobj->ktype->sysfs_ops)
                 ops = kobj->ktype->sysfs_ops;
-        else
-                ops = &subsys_sysfs_ops;
-
-        error = -EACCES;
-
-        /* No sysfs operations, either from having no subsystem,
-         * or the subsystem have no operations.
-         */
-        if (!ops)
+        else {
+                printk(KERN_ERR "missing sysfs attribute operations for "
+                       "kobject: %s\n", kobject_name(kobj));
+                WARN_ON(1);
                 goto err_out;
+        }
 
         /* File needs write support.
          * The inode's perms must say it's ok,