Re: [PATCH v2 0/4] PTP attribute handling cleanup

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Tue, 14 Feb 2017 10:23:30 -0800

PTP core was creating some attributes, such as "period" and "fifo", and the
entire "pins" attribute group, after creating class deevice, which creates
a race for userspace: uevent may arrive before all attributes are created.

This series of patches switches PTP to use is_visible() to control
visibility of attributes in a group, and device_create_with_groups() to
ensure that attributes are created before we notify userspace of a new
device.

Richard, please review.