clk: gpio: Get parent clk names in of_gpio_clk_setup()

Get parent clk names in of_gpio_clk_setup() and store the names
in struct clk_gpio_delayed_register_data instead of doing it from
the clk provider's get() callback. of_clk_get_parent_name() can't
be called in struct of_clk_provider's get() callback since it may
make a call to of_clk_get_from_provider() and this in turn tries
to recursively lock of_clk_mutex.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Cc: Sergej Sawazki <ce3a@gmx.de>
Fixes: 0a4807c2f9a4 ("clk: Make of_clk_get_parent_name() robust with #clock-cells = 1")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/drivers/clk/clk-gpio.c b/drivers/clk/clk-gpio.c
index 10819e2484145ebae0ef9b1092098d1bbc7848d1..335322dc403f48fcf773028d232e5c772f3cd8b5 100644 (file)
--- a/drivers/clk/clk-gpio.c
+++ b/drivers/clk/clk-gpio.c
@@ -209,6 +209,8 @@ EXPORT_SYMBOL_GPL(clk_register_gpio_mux);
 
 struct clk_gpio_delayed_register_data {
        const char *gpio_name;
+       int num_parents;
+       const char **parent_names;
        struct device_node *node;
        struct mutex lock;
        struct clk *clk;
@@ -222,8 +224,6 @@ static struct clk *of_clk_gpio_delayed_register_get(
 {
        struct clk_gpio_delayed_register_data *data = _data;
        struct clk *clk;
-       const char **parent_names;
-       int i, num_parents;
        int gpio;
        enum of_gpio_flags of_flags;
 
@@ -248,26 +248,14 @@ static struct clk *of_clk_gpio_delayed_register_get(
                return ERR_PTR(gpio);
        }
 
-       num_parents = of_clk_get_parent_count(data->node);
-
-       parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL);
-       if (!parent_names) {
-               clk = ERR_PTR(-ENOMEM);
-               goto out;
-       }
-
-       for (i = 0; i < num_parents; i++)
-               parent_names[i] = of_clk_get_parent_name(data->node, i);
-
-       clk = data->clk_register_get(data->node->name, parent_names,
-                       num_parents, gpio, of_flags & OF_GPIO_ACTIVE_LOW);
+       clk = data->clk_register_get(data->node->name, data->parent_names,
+                       data->num_parents, gpio, of_flags & OF_GPIO_ACTIVE_LOW);
        if (IS_ERR(clk))
                goto out;
 
        data->clk = clk;
 out:
        mutex_unlock(&data->lock);
-       kfree(parent_names);
 
        return clk;
 }
@@ -296,11 +284,24 @@ static void __init of_gpio_clk_setup(struct device_node *node,
                                unsigned gpio, bool active_low))
 {
        struct clk_gpio_delayed_register_data *data;
+       const char **parent_names;
+       int i, num_parents;
 
        data = kzalloc(sizeof(*data), GFP_KERNEL);
        if (!data)
                return;
 
+       num_parents = of_clk_get_parent_count(node);
+
+       parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL);
+       if (!parent_names)
+               return;
+
+       for (i = 0; i < num_parents; i++)
+               parent_names[i] = of_clk_get_parent_name(node, i);
+
+       data->num_parents = num_parents;
+       data->parent_names = parent_names;
        data->node = node;
        data->gpio_name = gpio_name;
        data->clk_register_get = clk_register_get;