clk: gpio: handle error codes for of_clk_get_parent_count()

We might make bad memory allocations if we get (e.g.) -ENOSYS from
of_clk_get_parent_count().

Noticed by Coverity.

Fixes: f66541ba02d5 ("clk: gpio: Get parent clk names in of_gpio_clk_setup()")
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Jyri Sarha <jsarha@ti.com>
Cc: Sergej Sawazki <ce3a@gmx.de>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>

diff --git a/drivers/clk/clk-gpio.c b/drivers/clk/clk-gpio.c
index c1baa89cbf919f40bc263e86b276696a41ec2723..1767b9e3ca9382e8f14b015309f60cb7b836cf84 100644 (file)
--- a/drivers/clk/clk-gpio.c
+++ b/drivers/clk/clk-gpio.c
@@ -287,12 +287,14 @@ static void __init of_gpio_clk_setup(struct device_node *node,
        const char **parent_names;
        int i, num_parents;
 
+       num_parents = of_clk_get_parent_count(node);
+       if (num_parents < 0)
+               return;
+
        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) {
                kfree(data);