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Joachim Wiberg
799fd93cac
Two related problems prevented devices behind an intermediate hub (e.g.
the VIA Labs hub on the RPi 400's VL805 xHCI) from being authorized
when confd unlocks a USB bus:
1. Cascade ordering: usb_authorize() ran nftw() with FTW_DEPTH, which
visits children before the root-hub entry. The hub was authorized
while authorized_default was still 2, so when the kernel probed the
hub's children it immediately denied them. Fix: write
authorized_default=1 on the bus before entering nftw.
2. Slow/async probe: hub port enumeration is asynchronous — devices
behind a hub may appear in sysfs after nftw has already finished.
Fix: add a udev rule that catches usb_device add events on buses
where authorized_default=1 is already set on any ancestor root hub
and authorizes them immediately.
The ATTRS{} matcher in udev walks the full sysfs parent chain, so
authorized_default=1 on the root hub is visible even for devices several
hubs deep. Buses still locked at authorized_default=0 are left alone.
Also expand the docstring in generic_usb_ports() to document the
design: each root hub gets its own uniquely-named entry (USB, or USB1/
USB2/... when multiple) so buses can be individually controlled, and
boards needing finer control should use DT usb-ports annotations.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>