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

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Date:   Thu, 25 Apr 2019 16:32:35 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ian Abbott <abbotti@....co.uk>
Cc:     Christoph Hellwig <hch@....de>,
        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 Thu, Apr 25, 2019 at 03:31:01PM +0100, Ian Abbott wrote:
> 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.

Then convert the drivers properly and pass on the device from them.