Commit ca66d9ce authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Wentao Guan
Browse files

gpio: pca953x: Fully convert to device managed resources 

stable inclusion
from stable-v6.6.76
commit f66aed661bf2c9600ab644fa7bca9addbd53db92
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IBW08Q

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f66aed661bf2c9600ab644fa7bca9addbd53db92



--------------------------------

[ Upstream commit 53c59d66c44c5eb98b34da9967f937e5387f8624 ]

Curtrently the error path is unsynchronised with removal due to
regulator being disabled before other device managed resources
are handled. Correct that by wrapping regulator enablement in
the respective call.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
Stable-dep-of: 7cef813a91c4 ("gpio: pca953x: log an error when failing to get the reset GPIO")
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
(cherry picked from commit f66aed661bf2c9600ab644fa7bca9addbd53db92)
Signed-off-by: default avatarWentao Guan <guanwentao@uniontech.com>
parent a79c6d33

drivers/gpio/gpio-pca953x.c

+35 −33
Original line number Diff line number Diff line
@@ -1047,13 +1047,40 @@ static int device_pca957x_init(struct pca953x_chip *chip) 
	return ret;

}



static void pca953x_disable_regulator(void *reg)

{

	regulator_disable(reg);

}



static int pca953x_get_and_enable_regulator(struct pca953x_chip *chip)

{

	struct device *dev = &chip->client->dev;

	struct regulator *reg = chip->regulator;

	int ret;



	reg = devm_regulator_get(dev, "vcc");

	if (IS_ERR(reg))

		return dev_err_probe(dev, PTR_ERR(reg), "reg get err\n");



	ret = regulator_enable(reg);

	if (ret)

	        return dev_err_probe(dev, ret, "reg en err\n");



	ret = devm_add_action_or_reset(dev, pca953x_disable_regulator, reg);

	if (ret)

		return ret;



	chip->regulator = reg;

	return 0;

}



static int pca953x_probe(struct i2c_client *client)

{

	struct device *dev = &client->dev;

	struct pca953x_platform_data *pdata;

	struct pca953x_chip *chip;

	int irq_base;

	int ret;

	struct regulator *reg;

	const struct regmap_config *regmap_config;



	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
@@ -1088,16 +1115,9 @@ static int pca953x_probe(struct i2c_client *client) 
	if (!chip->driver_data)

		return -ENODEV;



	reg = devm_regulator_get(&client->dev, "vcc");

	if (IS_ERR(reg))

		return dev_err_probe(&client->dev, PTR_ERR(reg), "reg get err\n");



	ret = regulator_enable(reg);

	if (ret) {

		dev_err(&client->dev, "reg en err: %d\n", ret);

	ret = pca953x_get_and_enable_regulator(chip);

	if (ret)

		return ret;

	}

	chip->regulator = reg;



	i2c_set_clientdata(client, chip);
@@ -1120,10 +1140,8 @@ static int pca953x_probe(struct i2c_client *client) 
	}



	chip->regmap = devm_regmap_init_i2c(client, regmap_config);

	if (IS_ERR(chip->regmap)) {

		ret = PTR_ERR(chip->regmap);

		goto err_exit;

	}

	if (IS_ERR(chip->regmap))

		return PTR_ERR(chip->regmap);



	regcache_mark_dirty(chip->regmap);
@@ -1158,28 +1176,13 @@ static int pca953x_probe(struct i2c_client *client) 
		ret = device_pca95xx_init(chip);

	}

	if (ret)

		goto err_exit;

		return ret;



	ret = pca953x_irq_setup(chip, irq_base);

	if (ret)

		goto err_exit;



	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);

	if (ret)

		goto err_exit;



	return 0;



err_exit:

	regulator_disable(chip->regulator);

		return ret;

}



static void pca953x_remove(struct i2c_client *client)

{

	struct pca953x_chip *chip = i2c_get_clientdata(client);



	regulator_disable(chip->regulator);

	return devm_gpiochip_add_data(dev, &chip->gpio_chip, chip);

}



#ifdef CONFIG_PM_SLEEP
@@ -1347,7 +1350,6 @@ static struct i2c_driver pca953x_driver = { 
		.acpi_match_table = pca953x_acpi_ids,

	},

	.probe		= pca953x_probe,

	.remove		= pca953x_remove,

	.id_table	= pca953x_id,

};