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authorPer Forlin <per.forlin@linaro.org>2011-07-01 18:55:33 +0200
committerChris Ball <cjb@laptop.org>2011-07-20 17:21:15 -0400
commitee8a43a51c7681f19fe23b6b936e1d8094a8b7d1 (patch)
tree8d4e11c82e24b2538c87fb655e499e7d7f9b99ca /drivers/mmc/card/queue.c
parent04296b7bfda45295a568b4b312e03828fae801dc (diff)
mmc: block: add handling for two parallel block requests in issue_rw_rq
Change mmc_blk_issue_rw_rq() to become asynchronous. The execution flow looks like this: * The mmc-queue calls issue_rw_rq(), which sends the request to the host and returns back to the mmc-queue. * The mmc-queue calls issue_rw_rq() again with a new request. * This new request is prepared in issue_rw_rq(), then it waits for the active request to complete before pushing it to the host. * When the mmc-queue is empty it will call issue_rw_rq() with a NULL req to finish off the active request without starting a new request. Signed-off-by: Per Forlin <per.forlin@linaro.org> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Venkatraman S <svenkatr@ti.com> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Tested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/card/queue.c')
-rw-r--r--drivers/mmc/card/queue.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index a38d310f503..45fb362e3f0 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -52,6 +52,7 @@ static int mmc_queue_thread(void *d)
down(&mq->thread_sem);
do {
struct request *req = NULL;
+ struct mmc_queue_req *tmp;
spin_lock_irq(q->queue_lock);
set_current_state(TASK_INTERRUPTIBLE);
@@ -59,7 +60,10 @@ static int mmc_queue_thread(void *d)
mq->mqrq_cur->req = req;
spin_unlock_irq(q->queue_lock);
- if (!req) {
+ if (req || mq->mqrq_prev->req) {
+ set_current_state(TASK_RUNNING);
+ mq->issue_fn(mq, req);
+ } else {
if (kthread_should_stop()) {
set_current_state(TASK_RUNNING);
break;
@@ -67,11 +71,14 @@ static int mmc_queue_thread(void *d)
up(&mq->thread_sem);
schedule();
down(&mq->thread_sem);
- continue;
}
- 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;
} while (1);
up(&mq->thread_sem);
@@ -97,7 +104,7 @@ static void mmc_request(struct request_queue *q)
return;
}
- if (!mq->mqrq_cur->req)
+ if (!mq->mqrq_cur->req && !mq->mqrq_prev->req)
wake_up_process(mq->thread);
}