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

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