1 files changed, 6 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c
index 3c048ac4e638..922dd612612e 100644
--- a/arch/sparc64/kernel/prom.c
+++ b/arch/sparc64/kernel/prom.c
@@ -59,6 +59,9 @@ int of_getintprop_default(struct device_node *np, const char *name, int def)
 }
 EXPORT_SYMBOL(of_getintprop_default);
 
+DEFINE_MUTEX(of_set_property_mutex);
+EXPORT_SYMBOL(of_set_property_mutex);
+
 int of_set_property(struct device_node *dp, const char *name, void *val, int len)
 {
         struct property **prevp;
@@ -82,7 +85,10 @@ int of_set_property(struct device_node *dp, const char *name, void *val, int len
                         void *old_val = prop->value;
                         int ret;
 
+                        mutex_lock(&of_set_property_mutex);
                         ret = prom_setprop(dp->node, name, val, len);
+                        mutex_unlock(&of_set_property_mutex);
+
                         err = -EINVAL;
                         if (ret >= 0) {
                                 prop->value = new_val;