Re: [PATCH] add transport class symlink to device object

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On 8/18/05, Greg KH <greg@kroah.com> wrote:
> @@ -500,9 +519,13 @@ int class_device_add(struct class_device
>        }
> 
>        class_device_add_attrs(class_dev);
> -       if (class_dev->dev)
> +       if (class_dev->dev) {
> +               class_name = make_class_name(class_dev);
>                sysfs_create_link(&class_dev->kobj,
>                                  &class_dev->dev->kobj, "device");
> +               sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj,
> +                                 class_name);
> +       }
> 

I wonder if we need to grab a reference to class_dev->dev here:

        dev = device_get(class_dev->dev);
        if (dev) {
             ....
        }

Otherwise, if device gets unregistered/deleted before class device is
deleted we'll get into trouble when removing the link since
class_dev->dev will be garbage.

.. But grabbing that reference will cause pains in SCSI system which,
when I looked, removed class devices from device's release function.

-- 
Dmitry