X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=block%2Fcfq-iosched.c;h=13553e015d7203f244db2e411884c56cbee1bc26;hb=62ca8792560e5bd7dc09f54ed3523a7864f416c7;hp=e47a9309eb485058b72d4649f631cf0029ee3dcb;hpb=b2451e4399d7233cd0008823872f51112d18f8d0;p=linux-2.6-omap-h63xx.git

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index e47a9309eb4..13553e015d7 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -789,6 +789,20 @@ static inline void cfq_slice_expired(struct cfq_data *cfqd, int timed_out)
 		__cfq_slice_expired(cfqd, cfqq, timed_out);
 }
 
+static int start_idle_class_timer(struct cfq_data *cfqd)
+{
+	unsigned long end = cfqd->last_end_request + CFQ_IDLE_GRACE;
+	unsigned long now = jiffies;
+
+	if (time_before(now, end) &&
+	    time_after_eq(now, cfqd->last_end_request)) {
+		mod_timer(&cfqd->idle_class_timer, end);
+		return 1;
+	}
+
+	return 0;
+}
+
 /*
  * Get next queue for service. Unless we have a queue preemption,
  * we'll simply select the first cfqq in the service tree.
@@ -805,19 +819,14 @@ static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd)
 	cfqq = rb_entry(n, struct cfq_queue, rb_node);
 
 	if (cfq_class_idle(cfqq)) {
-		unsigned long end;
-
 		/*
 		 * if we have idle queues and no rt or be queues had
 		 * pending requests, either allow immediate service if
 		 * the grace period has passed or arm the idle grace
 		 * timer
 		 */
-		end = cfqd->last_end_request + CFQ_IDLE_GRACE;
-		if (time_before(jiffies, end)) {
-			mod_timer(&cfqd->idle_class_timer, end);
+		if (start_idle_class_timer(cfqd))
 			cfqq = NULL;
-		}
 	}
 
 	return cfqq;
@@ -2036,17 +2045,14 @@ out_cont:
 static void cfq_idle_class_timer(unsigned long data)
 {
 	struct cfq_data *cfqd = (struct cfq_data *) data;
-	unsigned long flags, end;
+	unsigned long flags;
 
 	spin_lock_irqsave(cfqd->queue->queue_lock, flags);
 
 	/*
 	 * race with a non-idle queue, reset timer
 	 */
-	end = cfqd->last_end_request + CFQ_IDLE_GRACE;
-	if (!time_after_eq(jiffies, end))
-		mod_timer(&cfqd->idle_class_timer, end);
-	else
+	if (!start_idle_class_timer(cfqd))
 		cfq_schedule_dispatch(cfqd);
 
 	spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);
@@ -2068,9 +2074,10 @@ static void cfq_put_async_queues(struct cfq_data *cfqd)
 			cfq_put_queue(cfqd->async_cfqq[0][i]);
 		if (cfqd->async_cfqq[1][i])
 			cfq_put_queue(cfqd->async_cfqq[1][i]);
-		if (cfqd->async_idle_cfqq)
-			cfq_put_queue(cfqd->async_idle_cfqq);
 	}
+
+	if (cfqd->async_idle_cfqq)
+		cfq_put_queue(cfqd->async_idle_cfqq);
 }
 
 static void cfq_exit_queue(elevator_t *e)
@@ -2125,6 +2132,7 @@ static void *cfq_init_queue(struct request_queue *q)
 
 	INIT_WORK(&cfqd->unplug_work, cfq_kick_queue);
 
+	cfqd->last_end_request = jiffies;
 	cfqd->cfq_quantum = cfq_quantum;
 	cfqd->cfq_fifo_expire[0] = cfq_fifo_expire[0];
 	cfqd->cfq_fifo_expire[1] = cfq_fifo_expire[1];
@@ -2271,8 +2279,6 @@ static struct elevator_type iosched_cfq = {
 
 static int __init cfq_init(void)
 {
-	int ret;
-
 	/*
 	 * could be 0 on HZ < 1000 setups
 	 */
@@ -2284,11 +2290,9 @@ static int __init cfq_init(void)
 	if (cfq_slab_setup())
 		return -ENOMEM;
 
-	ret = elv_register(&iosched_cfq);
-	if (ret)
-		cfq_slab_kill();
+	elv_register(&iosched_cfq);
 
-	return ret;
+	return 0;
 }
 
 static void __exit cfq_exit(void)