Re: [PATCH v2 6/6] Revert "usb: udc: allow adding and removing the same gadget device"

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On Tue, Aug 18, 2020 at 10:05:51AM +0000, Peter Chen wrote:
>  
> > >
> > > diff --git a/drivers/usb/gadget/udc/core.c
> > > b/drivers/usb/gadget/udc/core.c index 473e74088b1f..43351b0af569
> > > 100644
> > > --- a/drivers/usb/gadget/udc/core.c
> > > +++ b/drivers/usb/gadget/udc/core.c
> > > @@ -1386,7 +1386,6 @@ void usb_del_gadget_udc(struct usb_gadget
> > > *gadget)  {
> > >  	usb_del_gadget(gadget);
> > >  	usb_put_gadget(gadget);
> > > -	memset(&gadget->dev, 0x00, sizeof(gadget->dev));
> > 
> > Shouldn't you do this patch earlier in the series, as the
> > usb_put_gadget() call could have freed the memory that is being cleared here?
> > 
> 
> If I did it earlier, it would cause dwc3 break if people do 'git bisect', dwc3 issue is
> fixed at patch 5.

If you use the patch I posted earlier:

	https://marc.info/?l=linux-usb&m=159605415210351&w=2

instead of this one then dwc3 would continue to work correctly during 
the intermediate stages of the series.

Alan Stern



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