Re: [PATCH] rt2x00: Endless loop on hub port power down

[Stanislaw Gruszka <sgruszka@redhat.com>]

On Thu, Apr 03, 2014 at 04:48:56PM +0200, Richard Genoud wrote:
> I've met an endless (or at least very long) loop if I power down the usb
> port on witch a usb wifi key is plugged.
> (Ok, it's not very smart to power down a usb port when a usb key is in
> used... but still, I think that should not lead to an endless loop).
>
> I have a lot of:
> ieee80211 phy1: rt2x00usb_vendor_request: Error - Vendor Request 0x07 failed for offset 0x0438 with error -71
> 
> (-71==-EPROTO)
> 
> How to reproduce:
> - plug an usb wifi key
> - ip link set wlan0 up
> - hub-ctrl -b usb_bus -d usb_device -P usb_port -p 0
> 
> hub-ctrl source: https://github.com/codazoda/hub-ctrl.c/blob/master/hub-ctrl.c
> 
> The following patch prevents the endless loop, but I'm really not sure
> that The Right Way To Do It (R)

If device disappear, we should get -ENODEV status, why we get -EPROTO ?

Stanislaw