linux-kernel - Re: [HOWTO] accessing the DMA mapped data

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Date:	Thu, 10 May 2007 16:49:03 +0530
From:	Mahesh <maheshk@...c.in>
To:	David Miller <davem@...emloft.net>
CC:	linux-kernel@...r.kernel.org, kernelnewbies@...linux.org
Subject: Re: [HOWTO] accessing the DMA mapped data

Hi Miller,

Thanks for replying.
> You can eithe keep track of this yourself, or (depending upon
> your usage) you might be able to use DMA pools, see
> dma_pool_create() and friends.
>   
I think you have not understood my question properly. My problem is, the 
layer above the driver will do
dma_map_single on a kmalloc'ed buffer and passes the result  (bus 
address) to the device driver. Now
the driver has to modify the contents of the the original buffer.
Is it possible to do that ??

-regards,
Mahesh

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