h63xx: tsc2101 alsa sound support

[linux-2.6-omap-h63xx.git] / block / elevator.c

diff --git a/block/elevator.c b/block/elevator.c
index 39dcccc82ada5b71e3105a8b7e9d8389fc9000b6..24b702d649a953977cafb7125ca1b81d73947cc3 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -64,7 +64,7 @@ inline int elv_rq_merge_ok(struct request *rq, struct bio *bio)
 }
 EXPORT_SYMBOL(elv_rq_merge_ok);
 
-inline int elv_try_merge(struct request *__rq, struct bio *bio)
+static inline int elv_try_merge(struct request *__rq, struct bio *bio)
 {
        int ret = ELEVATOR_NO_MERGE;
 
@@ -80,7 +80,6 @@ inline int elv_try_merge(struct request *__rq, struct bio *bio)
 
        return ret;
 }
-EXPORT_SYMBOL(elv_try_merge);
 
 static struct elevator_type *elevator_find(const char *name)
 {
@@ -140,28 +139,16 @@ static int elevator_attach(request_queue_t *q, struct elevator_type *e,
 
 static char chosen_elevator[16];
 
-static void elevator_setup_default(void)
+static int __init elevator_setup(char *str)
 {
-       struct elevator_type *e;
-
        /*
-        * If default has not been set, use the compiled-in selection.
+        * Be backwards-compatible with previous kernels, so users
+        * won't get the wrong elevator.
         */
-       if (!chosen_elevator[0])
-               strcpy(chosen_elevator, CONFIG_DEFAULT_IOSCHED);
-
-       /*
-        * If the given scheduler is not available, fall back to no-op.
-        */
-       if ((e = elevator_find(chosen_elevator)))
-               elevator_put(e);
+       if (!strcmp(str, "as"))
+               strcpy(chosen_elevator, "anticipatory");
        else
-               strcpy(chosen_elevator, "noop");
-}
-
-static int __init elevator_setup(char *str)
-{
-       strncpy(chosen_elevator, str, sizeof(chosen_elevator) - 1);
+               strncpy(chosen_elevator, str, sizeof(chosen_elevator) - 1);
        return 0;
 }
 
@@ -178,14 +165,16 @@ int elevator_init(request_queue_t *q, char *name)
        q->end_sector = 0;
        q->boundary_rq = NULL;
 
-       elevator_setup_default();
+       if (name && !(e = elevator_get(name)))
+               return -EINVAL;
 
-       if (!name)
-               name = chosen_elevator;
+       if (!e && *chosen_elevator && !(e = elevator_get(chosen_elevator)))
+               printk("I/O scheduler %s not found\n", chosen_elevator);
 
-       e = elevator_get(name);
-       if (!e)
-               return -EINVAL;
+       if (!e && !(e = elevator_get(CONFIG_DEFAULT_IOSCHED))) {
+               printk("Default I/O scheduler not found, using no-op\n");
+               e = elevator_get("noop");
+       }
 
        eq = kmalloc(sizeof(struct elevator_queue), GFP_KERNEL);
        if (!eq) {
@@ -304,7 +293,7 @@ void elv_requeue_request(request_queue_t *q, struct request *rq)
 
        rq->flags &= ~REQ_STARTED;
 
-       __elv_add_request(q, rq, ELEVATOR_INSERT_REQUEUE, 0);
+       elv_insert(q, rq, ELEVATOR_INSERT_REQUEUE);
 }
 
 static void elv_drain_elevator(request_queue_t *q)
@@ -321,40 +310,11 @@ static void elv_drain_elevator(request_queue_t *q)
        }
 }
 
-void __elv_add_request(request_queue_t *q, struct request *rq, int where,
-                      int plug)
+void elv_insert(request_queue_t *q, struct request *rq, int where)
 {
        struct list_head *pos;
        unsigned ordseq;
 
-       if (q->ordcolor)
-               rq->flags |= REQ_ORDERED_COLOR;
-
-       if (rq->flags & (REQ_SOFTBARRIER | REQ_HARDBARRIER)) {
-               /*
-                * toggle ordered color
-                */
-               q->ordcolor ^= 1;
-
-               /*
-                * barriers implicitly indicate back insertion
-                */
-               if (where == ELEVATOR_INSERT_SORT)
-                       where = ELEVATOR_INSERT_BACK;
-
-               /*
-                * this request is scheduling boundary, update end_sector
-                */
-               if (blk_fs_request(rq)) {
-                       q->end_sector = rq_end_sector(rq);
-                       q->boundary_rq = rq;
-               }
-       } else if (!(rq->flags & REQ_ELVPRIV) && where == ELEVATOR_INSERT_SORT)
-               where = ELEVATOR_INSERT_BACK;
-
-       if (plug)
-               blk_plug_device(q);
-
        rq->q = q;
 
        switch (where) {
@@ -435,6 +395,42 @@ void __elv_add_request(request_queue_t *q, struct request *rq, int where,
        }
 }
 
+void __elv_add_request(request_queue_t *q, struct request *rq, int where,
+                      int plug)
+{
+       if (q->ordcolor)
+               rq->flags |= REQ_ORDERED_COLOR;
+
+       if (rq->flags & (REQ_SOFTBARRIER | REQ_HARDBARRIER)) {
+               /*
+                * toggle ordered color
+                */
+               if (blk_barrier_rq(rq))
+                       q->ordcolor ^= 1;
+
+               /*
+                * barriers implicitly indicate back insertion
+                */
+               if (where == ELEVATOR_INSERT_SORT)
+                       where = ELEVATOR_INSERT_BACK;
+
+               /*
+                * this request is scheduling boundary, update
+                * end_sector
+                */
+               if (blk_fs_request(rq)) {
+                       q->end_sector = rq_end_sector(rq);
+                       q->boundary_rq = rq;
+               }
+       } else if (!(rq->flags & REQ_ELVPRIV) && where == ELEVATOR_INSERT_SORT)
+               where = ELEVATOR_INSERT_BACK;
+
+       if (plug)
+               blk_plug_device(q);
+
+       elv_insert(q, rq, where);
+}
+
 void elv_add_request(request_queue_t *q, struct request *rq, int where,
                     int plug)
 {
@@ -611,23 +607,23 @@ void elv_completed_request(request_queue_t *q, struct request *rq)
         * request is released from the driver, io must be done
         */
        if (blk_account_rq(rq)) {
-               struct request *first_rq = list_entry_rq(q->queue_head.next);
-
                q->in_flight--;
+               if (blk_sorted_rq(rq) && e->ops->elevator_completed_req_fn)
+                       e->ops->elevator_completed_req_fn(q, rq);
+       }
 
-               /*
-                * Check if the queue is waiting for fs requests to be
-                * drained for flush sequence.
-                */
-               if (q->ordseq && q->in_flight == 0 &&
+       /*
+        * Check if the queue is waiting for fs requests to be
+        * drained for flush sequence.
+        */
+       if (unlikely(q->ordseq)) {
+               struct request *first_rq = list_entry_rq(q->queue_head.next);
+               if (q->in_flight == 0 &&
                    blk_ordered_cur_seq(q) == QUEUE_ORDSEQ_DRAIN &&
                    blk_ordered_req_seq(first_rq) > QUEUE_ORDSEQ_DRAIN) {
                        blk_ordered_complete_seq(q, QUEUE_ORDSEQ_DRAIN, 0);
                        q->request_fn(q);
                }
-
-               if (blk_sorted_rq(rq) && e->ops->elevator_completed_req_fn)
-                       e->ops->elevator_completed_req_fn(q, rq);
        }
 }
 
@@ -663,8 +659,10 @@ int elv_register(struct elevator_type *e)
        spin_unlock_irq(&elv_list_lock);
 
        printk(KERN_INFO "io scheduler %s registered", e->elevator_name);
-       if (!strcmp(e->elevator_name, chosen_elevator))
-               printk(" (default)");
+       if (!strcmp(e->elevator_name, chosen_elevator) ||
+                       (!*chosen_elevator &&
+                        !strcmp(e->elevator_name, CONFIG_DEFAULT_IOSCHED)))
+                               printk(" (default)");
        printk("\n");
        return 0;
 }