linux-kernel - Re: [PATCH 2/2] dma:of: Use a mutex to protect the of_dma

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Date:	Sun, 21 Apr 2013 20:22:40 -0500
From:	Jon Hunter <jon-hunter@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Lars-Peter Clausen <lars@...afoo.de>,
	Vinod Koul <vinod.koul@...el.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] dma:of: Use a mutex to protect the of_dma_list


On 04/19/2013 06:13 PM, Arnd Bergmann wrote:
> On Saturday 20 April 2013, Jon Hunter wrote:
>> Change also means that of_dma_request_slave_channel() cannot be called
>> from a context where it is not possible to sleep too, right? May be
>> worth mentioning this in the changelog as well.
> 
> You already cannot do that, because it requires dma_list_mutex.

Right in the case where you use of_dma_simple_xlate(). However, someone
could implement whatever they wanted for the xlate. Probably not likely
as it needs to return struct dma_chan, but could be possible. That's
all. Not a big deal.

Cheers
Jon
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