staging:iio: dummy sysfs group for autogenerated base directories.

Needed to ensure the reference counting is correct.
Temporary fix whilst discussions are ongoing.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index 7ee4186c4dfa235102e83b86db5c245ab1adb5d6..8bee56250a96036c7d8a20f933a470003de19443 100644 (file)
--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -725,19 +725,29 @@ static ssize_t iio_show_dev_name(struct device *dev,
 
 static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL);
 
+static struct attribute *iio_base_dummy_attrs[] = {
+       NULL
+};
+static struct attribute_group iio_base_dummy_group = {
+       .attrs = iio_base_dummy_attrs,
+};
+
 static int iio_device_register_sysfs(struct iio_dev *dev_info)
 {
        int i, ret = 0;
        struct iio_dev_attr *p, *n;
 
-       if (dev_info->info->attrs) {
+       if (dev_info->info->attrs)
                ret = sysfs_create_group(&dev_info->dev.kobj,
                                         dev_info->info->attrs);
-               if (ret) {
-                       dev_err(dev_info->dev.parent,
-                               "Failed to register sysfs hooks\n");
-                       goto error_ret;
-               }
+       else
+               ret = sysfs_create_group(&dev_info->dev.kobj,
+                                        &iio_base_dummy_group);
+       
+       if (ret) {
+               dev_err(dev_info->dev.parent,
+                       "Failed to register sysfs hooks\n");
+               goto error_ret;
        }
 
        /*
@@ -753,7 +763,7 @@ static int iio_device_register_sysfs(struct iio_dev *dev_info)
                        if (ret < 0)
                                goto error_clear_attrs;
                }
-       if (dev_info->name) {
+       if (dev_info->name) { 
                ret = sysfs_add_file_to_group(&dev_info->dev.kobj,
                                              &dev_attr_name.attr,
                                              NULL);
@@ -770,6 +780,8 @@ error_clear_attrs:
        }
        if (dev_info->info->attrs)
                sysfs_remove_group(&dev_info->dev.kobj, dev_info->info->attrs);
+       else
+               sysfs_remove_group(&dev_info->dev.kobj, &iio_base_dummy_group);
 error_ret:
        return ret;
 
@@ -790,6 +802,8 @@ static void iio_device_unregister_sysfs(struct iio_dev *dev_info)
 
        if (dev_info->info->attrs)
                sysfs_remove_group(&dev_info->dev.kobj, dev_info->info->attrs);
+       else
+               sysfs_remove_group(&dev_info->dev.kobj, &iio_base_dummy_group);
 }
 
 /* Return a negative errno on failure */