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Date:   Fri, 14 Jun 2019 16:48:57 +0200
From:   Christoph Hellwig <>
To:     Greg KH <>
Cc:     Christoph Hellwig <>,
        Maarten Lankhorst <>,
        Maxime Ripard <>,
        Sean Paul <>, David Airlie <>,
        Daniel Vetter <>,
        Jani Nikula <>,
        Joonas Lahtinen <>,
        Rodrigo Vivi <>,
        Ian Abbott <>,
        H Hartley Sweeten <>,,,
        Intel Linux Wireless <>,,,,,,,,,
        "moderated list:ARM PORT" <>,
Subject: Re: [PATCH 12/16] staging/comedi: mark as broken

On Fri, Jun 14, 2019 at 04:02:39PM +0200, Greg KH wrote:
> Perhaps a hint as to how we can fix this up?  This is the first time
> I've heard of the comedi code not handling dma properly.

It can be fixed by:

 a) never calling virt_to_page (or vmalloc_to_page for that matter)
    on dma allocation
 b) never remapping dma allocation with conflicting cache modes
    (no remapping should be doable after a) anyway).

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