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

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Date:	Fri, 4 Apr 2014 10:04:53 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Richard Genoud <richard.genoud@...il.com>
Cc:	Ivo van Doorn <IvDoorn@...il.com>,
	Gertjan van Wingerde <gwingerde@...il.com>,
	Helmut Schaa <helmut.schaa@...glemail.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rt2x00: Endless loop on hub port power down

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
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