linux-kernel - [PATCH v3 03/10] gpio: wm8994: use gpiochip_dup_line

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Message-Id: <20231204093509.19225-4-brgl@bgdev.pl>
Date:   Mon,  4 Dec 2023 10:35:02 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH v3 03/10] gpio: wm8994: use gpiochip_dup_line_label()

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

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

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpio-wm8994.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-wm8994.c b/drivers/gpio/gpio-wm8994.c
index f4a474cef32d..bf05c9b5882b 100644
--- a/drivers/gpio/gpio-wm8994.c
+++ b/drivers/gpio/gpio-wm8994.c
@@ -8,6 +8,7 @@
  *
  */
 
+#include <linux/cleanup.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -193,18 +194,20 @@ static void wm8994_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 	for (i = 0; i < chip->ngpio; i++) {
 		int gpio = i + chip->base;
 		int reg;
-		const char *label;
 
 		/* We report the GPIO even if it's not requested since
 		 * we're also reporting things like alternate
 		 * functions which apply even when the GPIO is not in
 		 * use as a GPIO.
 		 */
-		label = gpiochip_is_requested(chip, i);
-		if (!label)
-			label = "Unrequested";
+		char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
+		if (IS_ERR(label)) {
+			dev_err(wm8994->dev, "Failed to duplicate label\n");
+			continue;
+		}
 
-		seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio, label);
+		seq_printf(s, " gpio-%-3d (%-20.20s) ", gpio,
+			   label ?: "Unrequested");
 
 		reg = wm8994_reg_read(wm8994, WM8994_GPIO_1 + i);
 		if (reg < 0) {
-- 
2.40.1