pinctrl: sppctl: use gpiochip_dup_line_label()

Use the new gpiochip_dup_line_label() helper to safely retrieve the
descriptor label.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/sunplus/sppctl.c b/drivers/pinctrl/sunplus/sppctl.c
index bb5ef391dbe4886d0ce182a78d4a9e72f7694ba1..ae156f779a16b8c4bb91c4cb0d5d4363ebd15d25 100644 (file)
--- a/drivers/pinctrl/sunplus/sppctl.c
+++ b/drivers/pinctrl/sunplus/sppctl.c
@@ -4,6 +4,7 @@
  * Copyright (C) Sunplus Tech / Tibbo Tech.
  */
 
+#include <linux/cleanup.h>
 #include <linux/bitfield.h>
 #include <linux/device.h>
 #include <linux/err.h>
@@ -500,16 +501,15 @@ static int sppctl_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
 
 static void sppctl_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 {
-       const char *label;
        int i;
 
        for (i = 0; i < chip->ngpio; i++) {
-               label = gpiochip_is_requested(chip, i);
-               if (!label)
-                       label = "";
+               char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
+               if (IS_ERR(label))
+                       continue;
 
                seq_printf(s, " gpio-%03d (%-16.16s | %-16.16s)", i + chip->base,
-                          chip->names[i], label);
+                          chip->names[i], label ?: "");
                seq_printf(s, " %c", sppctl_gpio_get_direction(chip, i) ? 'I' : 'O');
                seq_printf(s, ":%d", sppctl_gpio_get(chip, i));
                seq_printf(s, " %s", sppctl_first_get(chip, i) ? "gpi" : "mux");