[PATCH] powerpc: Add/remove/update properties in /proc/device-tree

Add support to the proc_device_tree file for removing
and updating properties.  Remove just removes the
proc file, update changes the data pointer within
the proc file.  The remainder of the device-tree
changes occur elsewhere.

Signed-off-by: Dave Boutcher <sleddog@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 29 insertions, 0 deletions

diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
index fb117b74809e..9bdd077d6f55 100644
--- a/fs/proc/proc_devtree.c
+++ b/fs/proc/proc_devtree.c
@@ -81,6 +81,30 @@ void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop
         __proc_device_tree_add_prop(pde, prop);
 }
 
+void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
+                                  struct property *prop)
+{
+        remove_proc_entry(prop->name, pde);
+}
+
+void proc_device_tree_update_prop(struct proc_dir_entry *pde,
+                                  struct property *newprop,
+                                  struct property *oldprop)
+{
+        struct proc_dir_entry *ent;
+
+        for (ent = pde->subdir; ent != NULL; ent = ent->next)
+                if (ent->data == oldprop)
+                        break;
+        if (ent == NULL) {
+                printk(KERN_WARNING "device-tree: property \"%s\" "
+                       " does not exist\n", oldprop->name);
+        } else {
+                ent->data = newprop;
+                ent->size = newprop->length;
+        }
+}
+
 /*
  * Process a node, adding entries for its children and its properties.
  */
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 74488e49166d..aa6322d45198 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -146,6 +146,11 @@ struct property;
 extern void proc_device_tree_init(void);
 extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *);
 extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop);
+extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde,
+                                         struct property *prop);
+extern void proc_device_tree_update_prop(struct proc_dir_entry *pde,
+                                         struct property *newprop,
+                                         struct property *oldprop);
 #endif /* CONFIG_PROC_DEVICETREE */
 
 extern struct proc_dir_entry *proc_symlink(const char *,