s390/vmlogrdr: cleanup driver attribute usage

Let the driver core handle driver attribute creation and removal. This
will simplify the code and eliminates races between attribute
availability and userspace notification via uevents.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
index e9d70aedbaa2c8a7d45200627c2a70667d1074ac..5138fc93dc00f1cd2fd24e6093c6ced8e68a8302 100644 (file)
--- a/drivers/s390/char/vmlogrdr.c
+++ b/drivers/s390/char/vmlogrdr.c
@@ -656,10 +656,19 @@ static ssize_t vmlogrdr_recording_status_show(struct device_driver *driver,
        len = strlen(buf);
        return len;
 }
-
-
 static DRIVER_ATTR(recording_status, 0444, vmlogrdr_recording_status_show,
                   NULL);
+static struct attribute *vmlogrdr_drv_attrs[] = {
+       &driver_attr_recording_status.attr,
+       NULL,
+};
+static struct attribute_group vmlogrdr_drv_attr_group = {
+       .attrs = vmlogrdr_drv_attrs,
+};
+static const struct attribute_group *vmlogrdr_drv_attr_groups[] = {
+       &vmlogrdr_drv_attr_group,
+       NULL,
+};
 
 static struct attribute *vmlogrdr_attrs[] = {
        &dev_attr_autopurge.attr,
@@ -704,9 +713,9 @@ static struct device_driver vmlogrdr_driver = {
        .name = "vmlogrdr",
        .bus  = &iucv_bus,
        .pm = &vmlogrdr_pm_ops,
+       .groups = vmlogrdr_drv_attr_groups,
 };
 
-
 static int vmlogrdr_register_driver(void)
 {
        int ret;
@@ -720,21 +729,14 @@ static int vmlogrdr_register_driver(void)
        if (ret)
                goto out_iucv;
 
-       ret = driver_create_file(&vmlogrdr_driver,
-                                &driver_attr_recording_status);
-       if (ret)
-               goto out_driver;
-
        vmlogrdr_class = class_create(THIS_MODULE, "vmlogrdr");
        if (IS_ERR(vmlogrdr_class)) {
                ret = PTR_ERR(vmlogrdr_class);
                vmlogrdr_class = NULL;
-               goto out_attr;
+               goto out_driver;
        }
        return 0;
 
-out_attr:
-       driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status);
 out_driver:
        driver_unregister(&vmlogrdr_driver);
 out_iucv:
@@ -748,7 +750,6 @@ static void vmlogrdr_unregister_driver(void)
 {
        class_destroy(vmlogrdr_class);
        vmlogrdr_class = NULL;
-       driver_remove_file(&vmlogrdr_driver, &driver_attr_recording_status);
        driver_unregister(&vmlogrdr_driver);
        iucv_unregister(&vmlogrdr_iucv_handler, 1);
 }