clk: Correct handling of NULL clk in __clk_{get, put}

Ensure clk->kref is dereferenced only when clk is not NULL.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 5517944..c42e608 100644 (file)
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2226,24 +2226,25 @@ EXPORT_SYMBOL_GPL(devm_clk_unregister);
  */
 int __clk_get(struct clk *clk)
 {
-       if (clk && !try_module_get(clk->owner))
-               return 0;
+       if (clk) {
+               if (!try_module_get(clk->owner))
+                       return 0;
 
-       kref_get(&clk->ref);
+               kref_get(&clk->ref);
+       }
        return 1;
 }
 
 void __clk_put(struct clk *clk)
 {
-       if (WARN_ON_ONCE(IS_ERR(clk)))
+       if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
                return;
 
        clk_prepare_lock();
        kref_put(&clk->ref, __clk_release);
        clk_prepare_unlock();
 
-       if (clk)
-               module_put(clk->owner);
+       module_put(clk->owner);
 }
 
 /***        clk rate change notifiers        ***/