linux-kernel - Re: [PATCH 01/18] MIPS: lantiq: pass struct device to DMA API functions

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Message-ID: <20190207232912.wfgejc5c6d6lk5so@pburton-laptop>
Date:   Thu, 7 Feb 2019 23:29:14 +0000
From:   Paul Burton <paul.burton@...s.com>
To:     Christoph Hellwig <hch@....de>
CC:     John Crispin <john@...ozen.org>, Vinod Koul <vkoul@...nel.org>,
        Dmitry Tarnyagin <dmitry.tarnyagin@...kless.no>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: Re: [PATCH 01/18] MIPS: lantiq: pass struct device to DMA API
 functions

Hi Christoph,

On Fri, Feb 01, 2019 at 09:47:44AM +0100, Christoph Hellwig wrote:
> The DMA API generally relies on a struct device to work properly, and
> only barely works without one for legacy reasons.  Pass the easily
> available struct device from the platform_device to remedy this.
> 
> Also use GFP_KERNEL instead of GFP_ATOMIC as the gfp_t for the memory
> allocation, as we aren't in interrupt context or under a lock.
> 
> Note that this whole function looks somewhat bogus given that we never
> even look at the returned dma address, and the CPHYSADDR magic on
> a returned noncached mapping looks "interesting".  But I'll leave
> that to people more familiar with the code to sort out.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/mips/lantiq/xway/vmmc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Would you like this to go through the MIPS tree or elsewhere? If the
latter:

    Acked-by: Paul Burton <paul.burton@...s.com>

Thanks,
    Paul