Re: [PATCH v2 1/4] dma-mapping: Add devm_ interface for dma_map_single()

[Joerg Roedel]

On Wed, Jun 04, 2014 at 10:04:08AM -0400, Tejun Heo wrote:
> Hmmm?  Don't we have drivers which map dma buffers on device init and
> release them on exit?  For dynamic usages, its usefulness is limited
> especially given that dynamic tracking of buffers usually would
> involve tracking of other information too in addition to dma buffer
> pointer themselves.  If alloc on init and free on exit is a very rare
> usage pattern, I have no objection against not adding devm interface
> for dma mappings.

Yes, but those drivers usually get DMA buffers at init time with the
dma_alloc_* interfaces. The dma_map_* interfaces discussed here belong
to the streaming DMA-API, so they are usually used for only one DMA
transaction before dma_unmap_* is called on them.

A devm interface for the dma_alloc_* family of functions would
actually make sense, but not for the dma_map_* functions.


	Joerg


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/