Re: [PATCH 1/2] staging: dwc2: when dma is disabled, clear dev->dma_mask

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On Wed, 8 May 2013, Matthijs Kooijman wrote:

> Hi Greg,
> 
> > Greg, is it ok for a HCD to modify hcd->self.uses_dma like this?
> perhaps you missed this question in my previous mail? :-)
> 
> Gr.
> 
> Matthijs
> 
> > diff --git a/drivers/staging/dwc2/hcd.c b/drivers/staging/dwc2/hcd.c
> > index d9a2055..18a91de 100644
> > --- a/drivers/staging/dwc2/hcd.c
> > +++ b/drivers/staging/dwc2/hcd.c
> > @@ -2766,6 +2766,9 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq,
> >         if (!hcd)
> >                 goto error1;
> >  
> > +       if (hsotg->core_params->dma_enable <= 0)
> > +               hcd->self.uses_dma = 0;
> > +
> >         hcd->has_tt = 1;
> >  
> >         spin_lock_init(&hsotg->lock);

This is okay providing you do it before calling usb_add_hcd().

Alan Stern

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