linux-kernel - Re: [PATCH v4 1/2] dma-mapping: move dma configuration to bus infrastructure

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Date:   Thu, 3 May 2018 14:21:47 +0200
From:   Christoph Hellwig <hch@....de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Nipun Gupta <nipun.gupta@....com>, robin.murphy@....com,
        hch@....de, linux@...linux.org.uk, gregkh@...uxfoundation.org,
        m.szyprowski@...sung.com, bhelgaas@...gle.com, zajec5@...il.com,
        andy.gross@...aro.org, david.brown@...aro.org,
        dan.j.williams@...el.com, vinod.koul@...el.com, robh+dt@...nel.org,
        frowand.list@...il.com, jarkko.sakkinen@...ux.intel.com,
        rafael.j.wysocki@...el.com, dmitry.torokhov@...il.com,
        johan@...nel.org, msuchanek@...e.de, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-wireless@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        dmaengine@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, bharat.bhushan@....com,
        leoyang.li@....com
Subject: Re: [PATCH v4 1/2] dma-mapping: move dma configuration to bus
        infrastructure

On Mon, Apr 30, 2018 at 12:41:24PM +0200, Thierry Reding wrote:
> On Sat, Apr 28, 2018 at 08:21:58AM +0530, Nipun Gupta wrote:
> [...]
> > diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c
> > index 88a3558..a9ec99d 100644
> > --- a/drivers/gpu/host1x/bus.c
> > +++ b/drivers/gpu/host1x/bus.c
> > @@ -314,6 +314,13 @@ static int host1x_device_match(struct device *dev, struct device_driver *drv)
> >  	return strcmp(dev_name(dev), drv->name) == 0;
> >  }
> >  
> > +static int host1x_dma_configure(struct device *dev)
> > +{
> > +	if (dev->of_node)
> > +		return of_dma_configure(dev, dev->of_node);
> 
> The conditional here is somewhat pointless since the of_node should
> always be set. If it weren't it should be considered a bug and this
> function welcome to crash to make that very obvious.

Agreed.  Please remove the check for the resend.