of: Improve prom_update_property() function

prom_update_property() currently fails if the property doesn't
actually exist yet which isn't what we want. Change to add-or-update
instead of update-only, then we can remove a lot duplicated lines.

Suggested-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Acked-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
index 927cbd115e53..df7dd08d4391 100644
--- a/fs/proc/proc_devtree.c
+++ b/fs/proc/proc_devtree.c
@@ -101,6 +101,11 @@ void proc_device_tree_update_prop(struct proc_dir_entry *pde,
 {
         struct proc_dir_entry *ent;
 
+        if (!oldprop) {
+                proc_device_tree_add_prop(pde, newprop);
+                return;
+        }
+
         for (ent = pde->subdir; ent != NULL; ent = ent->next)
                 if (ent->data == oldprop)
                         break;