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    SubjectRe: [PATCH] usb: gadget: aspeed: set port_dev dma mask
    On Fri, Mar 26, 2021 at 12:03:03PM +0000, Robin Murphy wrote:
    > This might happen to work out, but is far from correct. Just wait until you
    > try it on a platform where the USB controller is behind an IOMMU...
    >
    > It looks like something is more fundamentally wrong here - the device
    > passed to DMA API calls must be the actual hardware device performing the
    > DMA, which in USB-land I believe means the controller's sysdev.

    The shiny new usb_intf_get_dma_device API provides the device to use.

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