of: fix of_update_property()

The of_update_property() is intented to update a property in a node
and if the property does not exist, will add it.

The second search of the property is possibly won't be found, that
maybe removed by other thread just before the second search begain.

Using the __of_find_property() and __of_add_property() instead and
move them into lock operations.

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

1 files changed, 14 insertions, 22 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 6ad3dc976b18..239e3da9e728 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1597,7 +1597,7 @@ int of_update_property(struct device_node *np, struct property *newprop)
 {
         struct property **next, *oldprop;
         unsigned long flags;
-        int rc, found = 0;
+        int rc = 0;
 
         rc = of_property_notify(OF_RECONFIG_UPDATE_PROPERTY, np, newprop);
         if (rc)
@@ -1606,36 +1606,28 @@ int of_update_property(struct device_node *np, struct property *newprop)
         if (!newprop->name)
                 return -EINVAL;
 
-        oldprop = of_find_property(np, newprop->name, NULL);
-        if (!oldprop)
-                return of_add_property(np, newprop);
-
         raw_spin_lock_irqsave(&devtree_lock, flags);
-        next = &np->properties;
-        while (*next) {
-                if (*next == oldprop) {
-                        /* found the node */
-                        newprop->next = oldprop->next;
-                        *next = newprop;
-                        oldprop->next = np->deadprops;
-                        np->deadprops = oldprop;
-                        found = 1;
-                        break;
-                }
-                next = &(*next)->next;
+        oldprop = __of_find_property(np, newprop->name, NULL);
+        if (!oldprop) {
+                /* add the node */
+                rc = __of_add_property(np, newprop);
+        } else {
+                /* replace the node */
+                next = &oldprop;
+                newprop->next = oldprop->next;
+                *next = newprop;
+                oldprop->next = np->deadprops;
+                np->deadprops = oldprop;
         }
         raw_spin_unlock_irqrestore(&devtree_lock, flags);
 
-        if (!found)
-                return -ENODEV;
-
 #ifdef CONFIG_PROC_DEVICETREE
         /* try to add to proc as well if it was initialized */
-        if (np->pde)
+        if (!rc && np->pde)
                 proc_device_tree_update_prop(np->pde, newprop, oldprop);
 #endif /* CONFIG_PROC_DEVICETREE */
 
-        return 0;
+        return rc;
 }
 
 #if defined(CONFIG_OF_DYNAMIC)