linux-kernel - Re: [PATCH] common: dma-mapping: add support for generic dma_mmap

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Date:	Fri, 29 Jun 2012 15:16:54 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
CC:	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linaro-mm-sig@...ts.linaro.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Arnd Bergmann' <arnd@...db.de>,
	'Russell King - ARM Linux' <linux@....linux.org.uk>,
	'Benjamin Herrenschmidt' <benh@...nel.crashing.org>,
	'Konrad Rzeszutek Wilk' <konrad.wilk@...cle.com>,
	'David Gibson' <david@...son.dropbear.id.au>,
	'Subash Patel' <subash.ramaswamy@...aro.org>,
	'Sumit Semwal' <sumit.semwal@...aro.org>
Subject: Re: [PATCH] common: dma-mapping: add support for generic dma_mmap_*
 calls

Marek Szyprowski wrote:
> On Friday, June 29, 2012 1:10 PM Clemens Ladisch wrote:
>> Marek Szyprowski wrote:
>>> +++ b/drivers/base/dma-mapping.c
>>> ...
>>> +int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
>>> +		    void *cpu_addr, dma_addr_t dma_addr, size_t size)
>>> +{
>>> +	int ret = -ENXIO;
>>> +	...
>>> +	if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
>>> +		return ret;
>>
>> This will return -ENXIO if dma_mmap_from_coherent() succeeds.
>
> Thanks for spotting this!

Sorry, I was wrong; ret is actually set by dma_mmap_from_coherent's
output parameter.  (That function's documentation appears to be
incomplete.)


Regards,
Clemens
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