linux-kernel - Re: [BUG BISECT] Ethernet fail on VF50 (OF: Don't set default coherent DMA mask)

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Date:   Mon, 30 Jul 2018 11:23:06 +0200
From:   Christoph Hellwig <hch@....de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Christoph Hellwig <hch@....de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stefan Agner <stefan@...er.ch>,
        Fugang Duan <fugang.duan@....com>
Subject: Re: [BUG BISECT] Ethernet fail on VF50 (OF: Don't set default
        coherent DMA mask)

On Sat, Jul 28, 2018 at 09:58:20AM -0700, Guenter Roeck wrote:
> I would call it a serious regression. Also, no longer setting a default
> coherent DMA mask is a quite substantial behavioral change, especially
> if and since the code worked just fine up to now.
> 
> Crash when booting sam460ex attached below, as is a bisect log.

Things should be ok again with:

commit a5516219b10218a87abb3352c82248ce3088e94a
Author: Robin Murphy <robin.murphy@....com>
Date:   Fri Jul 27 15:14:15 2018 +0100

    of/platform: Initialise default DMA masks

from the lastest dma-mapping tree as of Friday.  It isn't in the
latest linux-next tree yet but be in the next one.