linux-kernel - Re: Regression: 6eb0233ec2d0 ("usb: don't inherity DMA properties for USB devices")

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Message-ID: <20210218150746.GA18220@lst.de>
Date:   Thu, 18 Feb 2021 16:07:46 +0100
From:   Christoph Hellwig <hch@....de>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     hch@....de, Greg KH <gregkh@...uxfoundation.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...hat.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        USB list <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Regression: 6eb0233ec2d0 ("usb: don't inherity DMA properties
 for USB devices")

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..