linux-kernel - Re: [PATCH 3/4] ARM/dma-mapping: don't handle NULL devices in dma-direct.h

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Message-ID: <20200918051030.GA21261@lst.de>
Date:   Fri, 18 Sep 2020 07:10:30 +0200
From:   Christoph Hellwig <hch@....de>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Christoph Hellwig <hch@....de>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Tony Lindgren <tony@...mide.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH 3/4] ARM/dma-mapping: don't handle NULL devices in
 dma-direct.h

On Thu, Sep 17, 2020 at 07:50:10PM +0100, Russell King - ARM Linux admin wrote:
> On Thu, Sep 17, 2020 at 07:32:28PM +0200, Christoph Hellwig wrote:
> > The DMA API removed support for not passing in a device a long time
> > ago, so remove the NULL checks.
> 
> What happens with ISA devices?

For actual drivers they've been switched to struct isa_driver, which
provides a struct device.  For some of the special case like the
arch/arm/kernel/dma-isa.c we now use static struct device instances.