1 files changed, 17 insertions, 9 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 687b00d67c8a..dcbe05616090 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -850,18 +850,21 @@ static void clk_change_rate(struct clk *clk)
 {
         struct clk *child;
         unsigned long old_rate;
+        unsigned long best_parent_rate = 0;
         struct hlist_node *tmp;
 
         old_rate = clk->rate;
 
+        if (clk->parent)
+                best_parent_rate = clk->parent->rate;
+
         if (clk->ops->set_rate)
-                clk->ops->set_rate(clk->hw, clk->new_rate, clk->parent->rate);
+                clk->ops->set_rate(clk->hw, clk->new_rate, best_parent_rate);
 
         if (clk->ops->recalc_rate)
-                clk->rate = clk->ops->recalc_rate(clk->hw,
-                                clk->parent->rate);
+                clk->rate = clk->ops->recalc_rate(clk->hw, best_parent_rate);
         else
-                clk->rate = clk->parent->rate;
+                clk->rate = best_parent_rate;
 
         if (clk->notifier_count && old_rate != clk->rate)
                 __clk_notify(clk, POST_RATE_CHANGE, old_rate, clk->rate);
@@ -999,7 +1002,7 @@ static struct clk *__clk_init_parent(struct clk *clk)
 
         if (!clk->parents)
                 clk->parents =
-                        kmalloc((sizeof(struct clk*) * clk->num_parents),
+                        kzalloc((sizeof(struct clk*) * clk->num_parents),
                                         GFP_KERNEL);
 
         if (!clk->parents)
@@ -1065,9 +1068,13 @@ static int __clk_set_parent(struct clk *clk, struct clk *parent)
         old_parent = clk->parent;
 
         /* find index of new parent clock using cached parent ptrs */
-        for (i = 0; i < clk->num_parents; i++)
-                if (clk->parents[i] == parent)
-                        break;
+        if (clk->parents)
+                for (i = 0; i < clk->num_parents; i++)
+                        if (clk->parents[i] == parent)
+                                break;
+        else
+                clk->parents = kzalloc((sizeof(struct clk*) * clk->num_parents),
+                                                                GFP_KERNEL);
 
         /*
          * find index of new parent clock using string name comparison
@@ -1076,7 +1083,8 @@ static int __clk_set_parent(struct clk *clk, struct clk *parent)
         if (i == clk->num_parents)
                 for (i = 0; i < clk->num_parents; i++)
                         if (!strcmp(clk->parent_names[i], parent->name)) {
-                                clk->parents[i] = __clk_lookup(parent->name);
+                                if (clk->parents)
+                                        clk->parents[i] = __clk_lookup(parent->name);
                                 break;
                         }