linux-kernel - RE: [PATCH] usb: gadget: f_acm: don't disable disabled EP

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Date:   Wed, 01 Jul 2020 09:53:54 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Peter Chen <peter.chen@....com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: gadget: f_acm: don't disable disabled EP

Peter Chen <peter.chen@....com> writes:

>  
>> > > @@ -425,9 +425,11 @@ static int acm_set_alt(struct usb_function *f, unsigned
>> intf, unsigned alt)
>> > >  	/* we know alt == 0, so this is an activation or a reset */
>> > >
>> > >  	if (intf == acm->ctrl_id) {
>> > > -		dev_vdbg(&cdev->gadget->dev,
>> > > -				"reset acm control interface %d\n", intf);
>> > > -		usb_ep_disable(acm->notify);
>> > > +		if (acm->notify->enabled) {
>> > > +			dev_vdbg(&cdev->gadget->dev,
>> > > +					"reset acm control interface %d\n", intf);
>> > > +			usb_ep_disable(acm->notify);
>> > > +		}
>> >
>> > But it does not fix any issues, the usb_ep_disable checks 'enabled' flag.
>> 
>> It generates spurious trace events if you enable them.
>> 
>
> You mean the trace events from core.c? If it is, we could try to improve it
> and indicate it is already enabled or disabled.

I agree :-)

-- 
balbi

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