Re: [PATCH] usb: gadget: aspeed: set port_dev dma mask
From: Christoph Hellwig <hch@lst.de>
Date: 2021-03-26 12:06:15
Also in:
linux-arm-kernel, linux-aspeed, lkml, openbmc
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.