linux-kernel - [PATCH 04/10] gpio: stmpe: use gpiochip_dup_line

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Date:   Wed, 29 Nov 2023 15:24:05 +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 04/10] gpio: stmpe: 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-stmpe.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-stmpe.c b/drivers/gpio/gpio-stmpe.c
index 27cc4da53565..6c5ee81d71b3 100644
--- a/drivers/gpio/gpio-stmpe.c
+++ b/drivers/gpio/gpio-stmpe.c
@@ -5,6 +5,7 @@
  * Author: Rabin Vincent <rabin.vincent@...ricsson.com> for ST-Ericsson
  */
 
+#include <linux/cleanup.h>
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
@@ -255,7 +256,6 @@ static void stmpe_dbg_show_one(struct seq_file *s,
 {
 	struct stmpe_gpio *stmpe_gpio = gpiochip_get_data(gc);
 	struct stmpe *stmpe = stmpe_gpio->stmpe;
-	const char *label = gpiochip_is_requested(gc, offset);
 	bool val = !!stmpe_gpio_get(gc, offset);
 	u8 bank = offset / 8;
 	u8 dir_reg = stmpe->regs[STMPE_IDX_GPDR_LSB + bank];
@@ -263,6 +263,10 @@ static void stmpe_dbg_show_one(struct seq_file *s,
 	int ret;
 	u8 dir;
 
+	char *label __free(kfree) = gpiochip_dup_line_label(gc, offset);
+	if (IS_ERR(label))
+		return;
+
 	ret = stmpe_reg_read(stmpe, dir_reg);
 	if (ret < 0)
 		return;
-- 
2.40.1