From 45f176aea60e9fe8c5fdf8e5c90e5c50c264d86f Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Thu, 26 Sep 2013 19:36:11 -0700 Subject: [PATCH] i2c: i2c-dev: Create 'name' attribute automatically The 'name' attribute is needed for all i2c-dev class devices, meaning it can be created automatically by pointing to it in the class data structure. This simplifies the code and reduces the probability for race conditions (the name attribute should exist by the time the device is announced to user space). Signed-off-by: Guenter Roeck Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-dev.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index c3ccdea..80b47e8 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -102,8 +102,8 @@ static void return_i2c_dev(struct i2c_dev *i2c_dev) kfree(i2c_dev); } -static ssize_t show_adapter_name(struct device *dev, - struct device_attribute *attr, char *buf) +static ssize_t name_show(struct device *dev, + struct device_attribute *attr, char *buf) { struct i2c_dev *i2c_dev = i2c_dev_get_by_minor(MINOR(dev->devt)); @@ -111,7 +111,13 @@ static ssize_t show_adapter_name(struct device *dev, return -ENODEV; return sprintf(buf, "%s\n", i2c_dev->adap->name); } -static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL); +static DEVICE_ATTR_RO(name); + +static struct attribute *i2c_attrs[] = { + &dev_attr_name.attr, + NULL, +}; +ATTRIBUTE_GROUPS(i2c); /* ------------------------------------------------------------------------- */ @@ -562,15 +568,10 @@ static int i2cdev_attach_adapter(struct device *dev, void *dummy) res = PTR_ERR(i2c_dev->dev); goto error; } - res = device_create_file(i2c_dev->dev, &dev_attr_name); - if (res) - goto error_destroy; pr_debug("i2c-dev: adapter [%s] registered as minor %d\n", adap->name, adap->nr); return 0; -error_destroy: - device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); error: return_i2c_dev(i2c_dev); return res; @@ -589,7 +590,6 @@ static int i2cdev_detach_adapter(struct device *dev, void *dummy) if (!i2c_dev) /* attach_adapter must have failed */ return 0; - device_remove_file(i2c_dev->dev, &dev_attr_name); return_i2c_dev(i2c_dev); device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr)); @@ -637,6 +637,7 @@ static int __init i2c_dev_init(void) res = PTR_ERR(i2c_dev_class); goto out_unreg_chrdev; } + i2c_dev_class->dev_groups = i2c_groups; /* Keep track of adapters which will be added or removed later */ res = bus_register_notifier(&i2c_bus_type, &i2cdev_notifier); -- 2.7.4