clk: sunxi: Remove use of variable length array

Using an array allocated on the stack may lead to stack overflows
and other problems so let's move the allocation to the heap
instead. This silences the following checker warning as well.

drivers/clk/sunxi/clk-sun8i-mbus.c:36:29: warning: Variable length array is used

Cc: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/drivers/clk/sunxi/clk-sun8i-mbus.c b/drivers/clk/sunxi/clk-sun8i-mbus.c
index 3aaa9cb..411d303 100644 (file)
--- a/drivers/clk/sunxi/clk-sun8i-mbus.c
+++ b/drivers/clk/sunxi/clk-sun8i-mbus.c
@@ -33,7 +33,7 @@ static DEFINE_SPINLOCK(sun8i_a23_mbus_lock);
 static void __init sun8i_a23_mbus_setup(struct device_node *node)
 {
        int num_parents = of_clk_get_parent_count(node);
-       const char *parents[num_parents];
+       const char **parents;
        const char *clk_name = node->name;
        struct resource res;
        struct clk_divider *div;
@@ -43,10 +43,14 @@ static void __init sun8i_a23_mbus_setup(struct device_node *node)
        void __iomem *reg;
        int err;
 
+       parents = kcalloc(num_parents, sizeof(*parents), GFP_KERNEL);
+       if (!parents)
+               return;
+
        reg = of_io_request_and_map(node, 0, of_node_full_name(node));
        if (!reg) {
                pr_err("Could not get registers for sun8i-mbus-clk\n");
-               return;
+               goto err_free_parents;
        }
 
        div = kzalloc(sizeof(*div), GFP_KERNEL);
@@ -90,6 +94,7 @@ static void __init sun8i_a23_mbus_setup(struct device_node *node)
        if (err)
                goto err_unregister_clk;
 
+       kfree(parents); /* parents is deep copied */
        /* The MBUS clocks needs to be always enabled */
        __clk_get(clk);
        clk_prepare_enable(clk);
@@ -109,5 +114,7 @@ err_unmap:
        iounmap(reg);
        of_address_to_resource(node, 0, &res);
        release_mem_region(res.start, resource_size(&res));
+err_free_parents:
+       kfree(parents);
 }
 CLK_OF_DECLARE(sun8i_a23_mbus, "allwinner,sun8i-a23-mbus-clk", sun8i_a23_mbus_setup);