linux-kernel - Re: [PATCH] dma-mapping: remove an unnecessary NULL check

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Message-ID: <ab71b3ad-c737-82ed-5727-9f4382569b4b@mev.co.uk>
Date:   Thu, 25 Apr 2019 15:31:01 +0100
From:   Ian Abbott <abbotti@....co.uk>
To:     Christoph Hellwig <hch@....de>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Jiri Slaby <jslaby@...e.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org,
        "kernel-janitors@...r.kernel.org H Hartley Sweeten" 
        <hsweeten@...ionengravers.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-mapping: remove an unnecessary NULL check

On 25/04/2019 15:18, Christoph Hellwig wrote:
> On Thu, Apr 25, 2019 at 03:13:49PM +0100, Ian Abbott wrote:
>> So for comedi_isadma, we can just replace the NULL with a pointer to a
>> static dummy device with a 24-bit coherent mask?
> 
> It should be converted to a proper isa_driver, so that it gets a real
> struct device.

But it will work as a short term solution?  comedi_isadma isn't a 
driver, but is used by a few comedi drivers for ISA cards.

-- 
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