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Date:   Fri, 28 Sep 2018 09:21:16 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Guo Ren <ren_guo@c-sky.com>
Cc:     akpm@linux-foundation.org, arnd@arndb.de,
        daniel.lezcano@linaro.org, davem@davemloft.net,
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        linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
        devicetree@vger.kernel.org, green.hu@gmail.com
Subject: Re: [PATCH V6 20/33] csky/dma: fix up dma_mapping error
Message-ID: <20180928162116.GF19827@infradead.org>
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 <378d4064bf29863785f4cc637999e07507e2e926.1538058840.git.ren_guo@c-sky.com>
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On Fri, Sep 28, 2018 at 08:51:17AM +0800, Guo Ren wrote:
> The arch_sync_dma_for_cpu()/arch_sync_dma_for_device() implementation is
> broken for some combinations that end up in a BUG() instead of performing
> the necessary flushes.

This should be folded into the original patch adding this code.