linux-kernel - Re: Question: how to copy to user space from a tasklet

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Message-ID: <4CB7ED67.2000407@s5r6.in-berlin.de>
Date:	Fri, 15 Oct 2010 07:57:59 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Tom Brown <sa212+emis@...onix.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Yong Zhang <yong.zhang@...driver.com>
Subject: Re: Question: how to copy to user space from a tasklet

Tom Brown wrote:
> [Sorry to have to ask this here - I can't find any driver-specific
> newsgroup or mailing lists - are there any??]

linux-newbie perhaps.

> I have a driver which needs to copy device data direct to user space
> from a tasklet.

One way would be to use mmap() to allocate the DMA buffer and insert it into
the user address space before DMA commences.  An additional poll/read/write
based protocol or so can be used for buffer management during DMA.
-- 
Stefan Richter
-=====-==-=- =-=- -====
http://arcgraph.de/sr/
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