[Linaro-mm-sig] [PATCH 3/8] ARM: dma-mapping: use asm-generic/dma-mapping-common.h

'Joerg Roedel' joro at 8bytes.org
Fri Jun 24 04:39:09 EDT 2011

On Tue, Jun 21, 2011 at 01:47:03PM +0200, Marek Szyprowski wrote:
> > I also think that it is better to attach and to detach dma_map_ops
> > dynamically.
> What's the point of such operations? Why do you want to change dma
> mapping methods in runtime?

That is dangerous. You have to make sure that there are no mappings
granted to the the device driver before changing the dma_ops of a device
at runtime. Otherwise existing mappings for a device may disappear and
confuse the driver and the device.


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