From e200c14f60765ee3be6517659ec8fea06e299e39 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Thu, 19 Jan 2012 20:58:13 -0800 Subject: hwmon: (lm70) Register hwmon device after creating attribute files, and remove it first Register hwmon device as last operation in the probe function to ensure that all attribute files exist when accessed from user applications. Otherwise, there is a short time frame where the device is registered as hwmon device but sysfs attributes do not yet exist. This could result in applications erroneously not detecting attributes. Signed-off-by: Guenter Roeck --- drivers/hwmon/lm70.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) (limited to 'drivers/hwmon') diff --git a/drivers/hwmon/lm70.c b/drivers/hwmon/lm70.c index 9c12ef3b863..61c2ffbb9dd 100644 --- a/drivers/hwmon/lm70.c +++ b/drivers/hwmon/lm70.c @@ -156,13 +156,6 @@ static int __devinit lm70_probe(struct spi_device *spi) mutex_init(&p_lm70->lock); p_lm70->chip = chip; - /* sysfs hook */ - p_lm70->hwmon_dev = hwmon_device_register(&spi->dev); - if (IS_ERR(p_lm70->hwmon_dev)) { - dev_dbg(&spi->dev, "hwmon_device_register failed.\n"); - status = PTR_ERR(p_lm70->hwmon_dev); - goto out_dev_reg_failed; - } spi_set_drvdata(spi, p_lm70); if ((status = device_create_file(&spi->dev, &dev_attr_temp1_input)) @@ -171,12 +164,20 @@ static int __devinit lm70_probe(struct spi_device *spi) goto out_dev_create_file_failed; } + /* sysfs hook */ + p_lm70->hwmon_dev = hwmon_device_register(&spi->dev); + if (IS_ERR(p_lm70->hwmon_dev)) { + dev_dbg(&spi->dev, "hwmon_device_register failed.\n"); + status = PTR_ERR(p_lm70->hwmon_dev); + goto out_dev_reg_failed; + } + return 0; +out_dev_reg_failed: + device_remove_file(&spi->dev, &dev_attr_name); out_dev_create_file_failed: device_remove_file(&spi->dev, &dev_attr_temp1_input); - hwmon_device_unregister(p_lm70->hwmon_dev); -out_dev_reg_failed: spi_set_drvdata(spi, NULL); kfree(p_lm70); return status; @@ -186,9 +187,9 @@ static int __devexit lm70_remove(struct spi_device *spi) { struct lm70 *p_lm70 = spi_get_drvdata(spi); + hwmon_device_unregister(p_lm70->hwmon_dev); device_remove_file(&spi->dev, &dev_attr_temp1_input); device_remove_file(&spi->dev, &dev_attr_name); - hwmon_device_unregister(p_lm70->hwmon_dev); spi_set_drvdata(spi, NULL); kfree(p_lm70); -- cgit v1.2.3