drivers: sh: clk: Avoid crashes when passing NULL clocks

[cascardo/linux.git] / drivers / sh / clk / core.c

diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c
index 6bf973b..92863e3 100644 (file)
--- a/drivers/sh/clk/core.c
+++ b/drivers/sh/clk/core.c
@@ -469,6 +469,9 @@ void clk_enable_init_clocks(void)
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+       if (!clk)
+               return 0;
+
        return clk->rate;
 }
 EXPORT_SYMBOL_GPL(clk_get_rate);
@@ -478,6 +481,9 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
        int ret = -EOPNOTSUPP;
        unsigned long flags;
 
+       if (!clk)
+               return 0;
+
        spin_lock_irqsave(&clock_lock, flags);
 
        if (likely(clk->ops && clk->ops->set_rate)) {
@@ -535,12 +541,18 @@ EXPORT_SYMBOL_GPL(clk_set_parent);
 
 struct clk *clk_get_parent(struct clk *clk)
 {
+       if (!clk)
+               return NULL;
+
        return clk->parent;
 }
 EXPORT_SYMBOL_GPL(clk_get_parent);
 
 long clk_round_rate(struct clk *clk, unsigned long rate)
 {
+       if (!clk)
+               return 0;
+
        if (likely(clk->ops && clk->ops->round_rate)) {
                unsigned long flags, rounded;