staging: android: timed_output: fix sysfs file creation race
The sysfs file for the driver was being created _after_ the device was announced to userspace, causing a race with any tools looking for sysfs files. Fix the race by using the default attribute group for the class. Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -36,8 +36,7 @@ static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
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return sprintf(buf, "%d\n", remaining);
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}
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static ssize_t enable_store(
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struct device *dev, struct device_attribute *attr,
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static ssize_t enable_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct timed_output_dev *tdev = dev_get_drvdata(dev);
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@ -50,8 +49,13 @@ static ssize_t enable_store(
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return size;
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}
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static DEVICE_ATTR_RW(enable);
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static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store);
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static struct attribute *timed_output_attrs[] = {
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&dev_attr_enable.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(timed_output);
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static int create_timed_output_class(void)
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{
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@ -60,6 +64,7 @@ static int create_timed_output_class(void)
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if (IS_ERR(timed_output_class))
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return PTR_ERR(timed_output_class);
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atomic_set(&device_count, 0);
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timed_output_class->dev_groups = timed_output_groups;
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}
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return 0;
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@ -82,27 +87,15 @@ int timed_output_dev_register(struct timed_output_dev *tdev)
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if (IS_ERR(tdev->dev))
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return PTR_ERR(tdev->dev);
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ret = device_create_file(tdev->dev, &dev_attr_enable);
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if (ret < 0)
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goto err_create_file;
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dev_set_drvdata(tdev->dev, tdev);
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tdev->state = 0;
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return 0;
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err_create_file:
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device_destroy(timed_output_class, MKDEV(0, tdev->index));
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pr_err("failed to register driver %s\n",
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tdev->name);
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return ret;
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}
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EXPORT_SYMBOL_GPL(timed_output_dev_register);
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void timed_output_dev_unregister(struct timed_output_dev *tdev)
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{
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tdev->enable(tdev, 0);
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device_remove_file(tdev->dev, &dev_attr_enable);
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device_destroy(timed_output_class, MKDEV(0, tdev->index));
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dev_set_drvdata(tdev->dev, NULL);
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}
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