Re: [PATCH v2] mmc: queue: exclude asynchronous transfer for special request

[Konstantin Dorfman <kdorfman@codeaurora.org>]

Reviewed-by: Konstantin Dorfman <kdorfman@codeaurora.org>

On 12/26/2012 03:40 AM, Seungwon Jeon wrote:
> Unlike normal r/w request, special requests(discard, flush)
> is finished with a one-time issue_fn. Request change to
> mqrq_prev makes unnecessary call.
>
> Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
> ---
>   drivers/mmc/card/queue.c |   10 ++++++++++
>   1 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
> index fadf52e..c7e8716 100644
> --- a/drivers/mmc/card/queue.c
> +++ b/drivers/mmc/card/queue.c
> @@ -24,6 +24,8 @@
>
>   #define MMC_QUEUE_SUSPENDED	(1 << 0)
>
> +#define MMC_REQ_SPECIAL_MASK	(REQ_DISCARD | REQ_FLUSH)
> +
>   /*
>    * Prepare a MMC request. This just filters out odd stuff.
>    */
> @@ -58,6 +60,7 @@ static int mmc_queue_thread(void *d)
>   	do {
>   		struct request *req = NULL;
>   		struct mmc_queue_req *tmp;
> +		unsigned int cmd_flags = 0;
>
>   		spin_lock_irq(q->queue_lock);
>   		set_current_state(TASK_INTERRUPTIBLE);
> @@ -67,12 +70,19 @@ static int mmc_queue_thread(void *d)
>
>   		if (req || mq->mqrq_prev->req) {
>   			set_current_state(TASK_RUNNING);
> +			cmd_flags = req ? req->cmd_flags : 0;
>   			mq->issue_fn(mq, req);
>
>   			/*
>   			 * Current request becomes previous request
>   			 * and vice versa.
> +			 * In case of special requests, current request
> +			 * has been finished. Do not remain it to previous
> +			 * request.
>   			 */
> +			if (cmd_flags & MMC_REQ_SPECIAL_MASK)
> +				mq->mqrq_cur->req = NULL;
> +
>   			mq->mqrq_prev->brq.mrq.data = NULL;
>   			mq->mqrq_prev->req = NULL;
>   			tmp = mq->mqrq_prev;
>


-- 
Konstantin Dorfman,
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