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Date:   Thu, 18 Feb 2021 16:07:46 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Thomas Zimmermann <tzimmermann@suse.de>
Cc:     hch@lst.de, Greg KH <gregkh@linuxfoundation.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@redhat.com>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        USB list <linux-usb@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Regression: 6eb0233ec2d0 ("usb: don't inherity DMA properties
 for USB devices")
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On Thu, Feb 18, 2021 at 03:56:00PM +0100, Thomas Zimmermann wrote:
> I only have udl devices, but I expect that other DRM USB adapters are also 
> affected.

Find where the driver calls dma_map_* itself instead of using the USB
wrappers and fix that..