linux-kernel - Re: [PATCH 2/3] spi: mediatek: Add spi bus for Mediatek MT8173

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Message-ID: <20150609103951.GA14071@sirena.org.uk>
Date:	Tue, 9 Jun 2015 11:39:51 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Eddie Huang <eddie.huang@...iatek.com>
Cc:	Leilk Liu (刘磊) <Leilk.Liu@...iatek.com>,
	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	HongZhou Yang <hongzhou.yang@...iatek.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH 2/3] spi: mediatek: Add spi bus for Mediatek MT8173

On Tue, Jun 09, 2015 at 06:05:21PM +0800, Eddie Huang wrote:

> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -539,8 +539,8 @@ static int __spi_map_msg(struct spi_master *master,
> struct spi_message *msg)
>         if (!master->can_dma)
>                 return 0;

> -       tx_dev = master->dma_tx->device->dev;
> -       rx_dev = master->dma_rx->device->dev;
> +       tx_dev = master->dma_tx ? master->dma_tx->device->dev :
> master->dev;
> +       rx_dev = master->dma_rx ? master->dma_rx->device->dev : master-

> Is this what you want ? Actually, I don't like first one at all.

Not quite what I'd been thinking of - we can't just pick the device in
the core safely, the device might be a MFD or have some other
restriction that needs us to use a separate struct device.  However most
of those cases are likely to point towards implementing a dmaengine
device so probably the above will work for most cases and is fine.  Can
you send a proper patch please?

Please don't use the ternery operator, though.

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