From 7ed88aa2efa5422f9d93fd99f2a01c56e28a7409 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 2 Jan 2016 10:01:34 +0000 Subject: [PATCH] clk: fix clk-gpio.c with optional clock= DT property When the clock DT property is not given, of_clk_get_parent_count() returns -ENOENT, which then tries to allocate -2 x 4 bytes of memory, which of course fails, causing the whole driver to fail to create the clock. This causes the SolidRun platforms to fail probing the SDHCI1 interface which is connected to the WiFi. Fix this by detecting errno codes, skipping the allocation, and fixing of_clk_gpio_gate_delayed_register_get() to handle a NULL parent_names array. Fixes: 80eeb1f0f757 ("clk: add gpio controlled clock multiplexer") Signed-off-by: Russell King Signed-off-by: Michael Turquette --- drivers/clk/clk-gpio.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-) diff --git a/drivers/clk/clk-gpio.c b/drivers/clk/clk-gpio.c index 1767b9e3ca93..19fed65587e8 100644 --- a/drivers/clk/clk-gpio.c +++ b/drivers/clk/clk-gpio.c @@ -264,8 +264,8 @@ static struct clk *of_clk_gpio_gate_delayed_register_get(const char *name, const char * const *parent_names, u8 num_parents, unsigned gpio, bool active_low) { - return clk_register_gpio_gate(NULL, name, parent_names[0], - gpio, active_low, 0); + return clk_register_gpio_gate(NULL, name, parent_names ? + parent_names[0] : NULL, gpio, active_low, 0); } static struct clk *of_clk_gpio_mux_delayed_register_get(const char *name, @@ -295,14 +295,18 @@ static void __init of_gpio_clk_setup(struct device_node *node, if (!data) return; - parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL); - if (!parent_names) { - kfree(data); - return; - } + if (num_parents) { + parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL); + if (!parent_names) { + kfree(data); + return; + } - for (i = 0; i < num_parents; i++) - parent_names[i] = of_clk_get_parent_name(node, i); + for (i = 0; i < num_parents; i++) + parent_names[i] = of_clk_get_parent_name(node, i); + } else { + parent_names = NULL; + } data->num_parents = num_parents; data->parent_names = parent_names;