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Commit 45c5a914 authored by Seungwon Jeon's avatar Seungwon Jeon Committed by Chris Ball
Browse files

mmc: queue: amend buffer swap for non-blocking transfer 



In case both 'req' and 'mq->mqrq_prev->req' are null, there is no request
to be processed. That means there is no need to switch buffer.
Switching buffer is required only after finishing 'issue_fn'.

Signed-off-by: default avatarSeungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: default avatarPer Forlin <per.forlin@stericsson.com>
Tested-by: default avatarJohan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 42cd95a0

drivers/mmc/card/queue.c

+10 −7
Original line number Diff line number Diff line
@@ -68,6 +68,16 @@ static int mmc_queue_thread(void *d) 
		if (req || mq->mqrq_prev->req) {

			set_current_state(TASK_RUNNING);

			mq->issue_fn(mq, req);



			/*

			 * Current request becomes previous request

			 * and vice versa.

			 */

			mq->mqrq_prev->brq.mrq.data = NULL;

			mq->mqrq_prev->req = NULL;

			tmp = mq->mqrq_prev;

			mq->mqrq_prev = mq->mqrq_cur;

			mq->mqrq_cur = tmp;

		} else {

			if (kthread_should_stop()) {

				set_current_state(TASK_RUNNING);
@@ -77,13 +87,6 @@ static int mmc_queue_thread(void *d) 
			schedule();

			down(&mq->thread_sem);

		}



		/* Current request becomes previous request and vice versa. */

		mq->mqrq_prev->brq.mrq.data = NULL;

		mq->mqrq_prev->req = NULL;

		tmp = mq->mqrq_prev;

		mq->mqrq_prev = mq->mqrq_cur;

		mq->mqrq_cur = tmp;

	} while (1);

	up(&mq->thread_sem);