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

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Date:   Thu, 28 Nov 2019 09:21:08 +0000
From:   Henry Lin <henryl@...dia.com>
To:     Peter Chen <peter.chen@....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>,
        EJ Hsu <ejh@...dia.com>
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.
Using Windows host (without any proprietary NCM/ECM driver installed) can reproduce set alt
to 0. We just used Win10 to confirm this.