linux-hardening - [PATCH v2 5/7] gpio: 74x164: Fully convert to use managed resources

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250207151825.2122419-6-andriy.shevchenko@linux.intel.com>
Date: Fri,  7 Feb 2025 17:17:12 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: [PATCH v2 5/7] gpio: 74x164: Fully convert to use managed resources

Convert the driver probe stage to use managed resources.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/gpio/gpio-74x164.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c
index 0f720d539fa7..ecd691de8539 100644
--- a/drivers/gpio/gpio-74x164.c
+++ b/drivers/gpio/gpio-74x164.c
@@ -95,6 +95,19 @@ static int gen_74x164_direction_output(struct gpio_chip *gc,
 	return 0;
 }
 
+static void gen_74x164_deactivate(void *data)
+{
+	struct gen_74x164_chip *chip = data;
+
+	gpiod_set_value_cansleep(chip->gpiod_oe, 0);
+}
+
+static int gen_74x164_activate(struct device *dev, struct gen_74x164_chip *chip)
+{
+	gpiod_set_value_cansleep(chip->gpiod_oe, 1);
+	return devm_add_action_or_reset(dev, gen_74x164_deactivate, chip);
+}
+
 static int gen_74x164_probe(struct spi_device *spi)
 {
 	struct device *dev = &spi->dev;
@@ -128,8 +141,6 @@ static int gen_74x164_probe(struct spi_device *spi)
 	if (IS_ERR(chip->gpiod_oe))
 		return PTR_ERR(chip->gpiod_oe);
 
-	spi_set_drvdata(spi, chip);
-
 	chip->gpio_chip.label = spi->modalias;
 	chip->gpio_chip.direction_output = gen_74x164_direction_output;
 	chip->gpio_chip.get = gen_74x164_get_value;
@@ -149,18 +160,13 @@ static int gen_74x164_probe(struct spi_device *spi)
 	if (ret)
 		return dev_err_probe(&spi->dev, ret, "Config write failed\n");
 
-	gpiod_set_value_cansleep(chip->gpiod_oe, 1);
+	ret = gen_74x164_activate(dev, chip);
+	if (ret)
+		return ret;
 
 	return devm_gpiochip_add_data(&spi->dev, &chip->gpio_chip, chip);
 }
 
-static void gen_74x164_remove(struct spi_device *spi)
-{
-	struct gen_74x164_chip *chip = spi_get_drvdata(spi);
-
-	gpiod_set_value_cansleep(chip->gpiod_oe, 0);
-}
-
 static const struct spi_device_id gen_74x164_spi_ids[] = {
 	{ .name = "74hc595" },
 	{ .name = "74lvc594" },
@@ -181,7 +187,6 @@ static struct spi_driver gen_74x164_driver = {
 		.of_match_table	= gen_74x164_dt_ids,
 	},
 	.probe		= gen_74x164_probe,
-	.remove		= gen_74x164_remove,
 	.id_table	= gen_74x164_spi_ids,
 };
 module_spi_driver(gen_74x164_driver);
-- 
2.43.0.rc1.1336.g36b5255a03ac