[PATCH v2 01/12] mmc: add none blocking mmc request function

[David Vrabel]

On 06/04/11 20:07, Per Forlin wrote:
> Previously there has only been one function mmc_wait_for_req
> to start and wait for a request. This patch adds
>  * mmc_start_req - starts a request wihtout waiting
>  * mmc_wait_for_req_done - waits until request is done
>  * mmc_pre_req - asks the host driver to prepare for the next job
>  * mmc_post_req - asks the host driver to clean up after a completed job

If MMC core had a queue of requests internally you wouldn't need to
provide mmc_pre_req() and mmc_post_req() functions outside of the core.
 i.e., the mmc block driver would just need to queue up two mmc requests
and the core would take care of calling pre_req and post_req at the
correct time.

Using a MMC request queue has other benefits -- it allows multiple users
without having to claim/release the host.  This would be useful for
(especially multi-function) SDIO.

David
-- 
David Vrabel, Senior Software Engineer, Drivers
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