linux-kernel - [PATCH 1/2] gpio: sim: use sysfs

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Date:   Wed,  9 Aug 2023 15:14:41 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 1/2] gpio: sim: use sysfs_streq() and avoid an strdup()

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

When comparing strings passed to us from configfs, we can pass the page
argument directly to sysfs_streq() and avoid manual string trimming.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpio-sim.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c
index 8b49b0abacd5..dc4097dc0fbc 100644
--- a/drivers/gpio/gpio-sim.c
+++ b/drivers/gpio/gpio-sim.c
@@ -1272,7 +1272,6 @@ gpio_sim_hog_config_direction_store(struct config_item *item,
 {
 	struct gpio_sim_hog *hog = to_gpio_sim_hog(item);
 	struct gpio_sim_device *dev = gpio_sim_hog_get_device(hog);
-	char *trimmed;
 	int dir;
 
 	mutex_lock(&dev->lock);
@@ -1282,23 +1281,15 @@ gpio_sim_hog_config_direction_store(struct config_item *item,
 		return -EBUSY;
 	}
 
-	trimmed = gpio_sim_strdup_trimmed(page, count);
-	if (!trimmed) {
-		mutex_unlock(&dev->lock);
-		return -ENOMEM;
-	}
-
-	if (strcmp(trimmed, "input") == 0)
+	if (sysfs_streq(page, "input"))
 		dir = GPIOD_IN;
-	else if (strcmp(trimmed, "output-high") == 0)
+	else if (sysfs_streq(page, "output-high"))
 		dir = GPIOD_OUT_HIGH;
-	else if (strcmp(trimmed, "output-low") == 0)
+	else if (sysfs_streq(page, "output-low"))
 		dir = GPIOD_OUT_LOW;
 	else
 		dir = -EINVAL;
 
-	kfree(trimmed);
-
 	if (dir < 0) {
 		mutex_unlock(&dev->lock);
 		return dir;
-- 
2.39.2