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mmc: queue: exclude asynchronous transfer for special request

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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>
Reviewed-by: Konstantin Dorfman <kdorfman@codeaurora.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Seungwon Jeon 2012-12-26 10:40:17 +09:00 committed by Chris Ball
parent 8af5075088
commit 369d321ed1
1 changed files with 10 additions and 0 deletions
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10
drivers/mmc/card/queue.c
View file

@ -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 assign 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;