linux-kernel - [PATCH] gpio: sysfs: demote warning messages on invalid user input to debug

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Message-ID: <20241021185717.96449-1-brgl@bgdev.pl>
Date: Mon, 21 Oct 2024 20:57:17 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] gpio: sysfs: demote warning messages on invalid user input to debug

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

We should not emit a non-ratelimited warning everytime a user passes an
invalid value to /sys/class/gpio/export as it's an easy way to spam the
kernel log. Change the relevant messages to pr_debug_ratelimited().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpiolib-sysfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 0c713baa7784..203fc3394afe 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -463,7 +463,7 @@ static ssize_t export_store(const struct class *class,
 	desc = gpio_to_desc(gpio);
 	/* reject invalid GPIOs */
 	if (!desc) {
-		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
+		pr_debug_ratelimited("%s: invalid GPIO %ld\n", __func__, gpio);
 		return -EINVAL;
 	}
 
@@ -473,7 +473,7 @@ static ssize_t export_store(const struct class *class,
 
 	offset = gpio_chip_hwgpio(desc);
 	if (!gpiochip_line_is_valid(guard.gc, offset)) {
-		pr_warn("%s: GPIO %ld masked\n", __func__, gpio);
+		pr_debug_ratelimited("%s: GPIO %ld masked\n", __func__, gpio);
 		return -EINVAL;
 	}
 
@@ -520,7 +520,7 @@ static ssize_t unexport_store(const struct class *class,
 	desc = gpio_to_desc(gpio);
 	/* reject bogus commands (gpiod_unexport() ignores them) */
 	if (!desc) {
-		pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
+		pr_debug_ratelimited("%s: invalid GPIO %ld\n", __func__, gpio);
 		return -EINVAL;
 	}
 
-- 
2.43.0