Re: [PATCH][2/4] usb: only set URB_NO_TRANSFER_DMA_MAP when dma is enabled

On Thursday 24 January 2008, Magnus Damm wrote:
> Hi guys,
> 
> Thanks for all your help so far.
> 
> On Jan 14, 2008 11:08 AM, Magnus Damm <[email protected]> wrote:
> > usb: only set URB_NO_TRANSFER_DMA_MAP when dma is enabled
> >
> > usb_sg_init() currently sets URB_NO_TRANSFER_DMA_MAP even if dma isn't
> > enabled. This patch changes the code so URB_NO_TRANSFER_DMA_MAP gets
> > set only when dma is enabled and transfer_dma is valid.
> >
> > Signed-off-by: Magnus Damm <[email protected]>
> 
> What about this patch? Any thoughts?
> 
> This patch is needed for usb storage to work properly with ohci-sm501.
> Should URB_NO_TRANSFER_DMA_MAP really be set even if dma isn't used? I
> say not.

Makes sense.



> Thanks,
> 
> / magnus
> 
> > --- 0001/drivers/usb/core/message.c
> > +++ work/drivers/usb/core/message.c     2008-01-13 18:53:13.000000000 +0900
> > @@ -394,7 +394,7 @@ int usb_sg_init (
> >         if (!io->urbs)
> >                 goto nomem;
> >
> > -       urb_flags = URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT;
> > +       urb_flags = URB_NO_INTERRUPT;
> >         if (usb_pipein (pipe))
> >                 urb_flags |= URB_SHORT_NOT_OK;
> >
> > @@ -432,6 +432,7 @@ int usb_sg_init (
> >                  * to prevent stale pointers and to help spot bugs.
> >                  */
> >                 if (dma) {
> > +                       io->urbs[i]->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
> >                         io->urbs [i]->transfer_dma = sg_dma_address (sg + i);
> >                         len = sg_dma_len (sg + i);
> >  #if defined(CONFIG_HIGHMEM) || defined(CONFIG_GART_IOMMU)
> >
> 



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