Fix memory issue in non-DMA mode for MUSB gadget

[Bin Liu <b-liu@ti.com>]

Hi,

On Thu, Jul 26, 2018 at 12:52:57PM +0000, Alexey Spirkov wrote:
> dma_mapping_error function unable to works in PowerPC arch
> when MUSB do not use DMA (illegal memory access). Proposed
> patch replace its usage to usual define for checking DMA mapping.
> 
> Signed-off-by: Alexey Spirkov <alexeis@astrosoft.ru>
> ---
>  drivers/usb/musb/musb_gadget.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
> index eae8b1b..3bc7c25 100644
> --- a/drivers/usb/musb/musb_gadget.c
> +++ b/drivers/usb/musb/musb_gadget.c
> @@ -140,7 +140,7 @@ __acquires(ep->musb->lock)
>  	ep->busy = 1;
>  	spin_unlock(&musb->lock);
>  
> -	if (!dma_mapping_error(&musb->g.dev, request->dma))
> +	if (req && is_buffer_mapped(req))

unmap_dma_buffer() checks for is_buffer_mapped(), so this line can be
dropped.

>  		unmap_dma_buffer(req, musb);
>  
>  	trace_musb_req_gb(req);

Regards,
-Bin.
---
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html