1 files changed, 53 insertions, 0 deletions

diff --git a/arch/sparc/kernel/prom.c b/arch/sparc/kernel/prom.c
index 63b2b9bd778e..f3f53f2e0e1e 100644
--- a/arch/sparc/kernel/prom.c
+++ b/arch/sparc/kernel/prom.c
@@ -27,6 +27,11 @@
 
 static struct device_node *allnodes;
 
+/* use when traversing tree through the allnext, child, sibling,
+ * or parent members of struct device_node.
+ */
+static DEFINE_RWLOCK(devtree_lock);
+
 int of_device_is_compatible(struct device_node *device, const char *compat)
 {
         const char* cp;
@@ -185,6 +190,54 @@ int of_getintprop_default(struct device_node *np, const char *name, int def)
 }
 EXPORT_SYMBOL(of_getintprop_default);
 
+int of_set_property(struct device_node *dp, const char *name, void *val, int len)
+{
+        struct property **prevp;
+        void *new_val;
+        int err;
+
+        new_val = kmalloc(len, GFP_KERNEL);
+        if (!new_val)
+                return -ENOMEM;
+
+        memcpy(new_val, val, len);
+
+        err = -ENODEV;
+
+        write_lock(&devtree_lock);
+        prevp = &dp->properties;
+        while (*prevp) {
+                struct property *prop = *prevp;
+
+                if (!strcmp(prop->name, name)) {
+                        void *old_val = prop->value;
+                        int ret;
+
+                        ret = prom_setprop(dp->node, name, val, len);
+                        err = -EINVAL;
+                        if (ret >= 0) {
+                                prop->value = new_val;
+                                prop->length = len;
+
+                                if (OF_IS_DYNAMIC(prop))
+                                        kfree(old_val);
+
+                                OF_MARK_DYNAMIC(prop);
+
+                                err = 0;
+                        }
+                        break;
+                }
+                prevp = &(*prevp)->next;
+        }
+        write_unlock(&devtree_lock);
+
+        /* XXX Upate procfs if necessary... */
+
+        return err;
+}
+EXPORT_SYMBOL(of_set_property);
+
 static unsigned int prom_early_allocated;
 
 static void * __init prom_early_alloc(unsigned long size)