linux-kernel - RE: [PATCH] usb: gadget: f_ncm: fix wrong usb

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Date:   Wed, 27 Nov 2019 01:54:22 +0000
From:   Peter Chen <peter.chen@....com>
To:     Henry Lin <henryl@...dia.com>
CC:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Romain Izard <romain.izard.pro@...il.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: gadget: f_ncm: fix wrong usb_ep

 
> >Does your UDC driver call composite_disconnect when disconnect from the host?
> >It should set all desc to NULL at related function ->disable.
> 
> For ECM case, if ecm_set_alt() gets called with alt == 0, in_ep->desc and out_ep-
> >desc will be set up. But these two ep will not be enabled as gether_connect() is not
> executed. During disconnect from the host, ecm_disable() gets called with ep
> disabled. In this case, gether_disconnect() will not get called to set desc to NULL.

Would you please share your test case? I use Linux host, and the host will always set alt for 1,
and doesn't have this issue.

Peter