linux-kernel - Re: [PATCH V6 20/33] csky/dma: fix up dma

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Message-ID: <20180928162116.GF19827@infradead.org>
Date:   Fri, 28 Sep 2018 09:21:16 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Guo Ren <ren_guo@...ky.com>
Cc:     akpm@...ux-foundation.org, arnd@...db.de,
        daniel.lezcano@...aro.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, jason@...edaemon.net,
        marc.zyngier@....com, mark.rutland@....com,
        mchehab+samsung@...nel.org, peterz@...radead.org, robh@...nel.org,
        robh+dt@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        devicetree@...r.kernel.org, green.hu@...il.com
Subject: Re: [PATCH V6 20/33] csky/dma: fix up dma_mapping error

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.