ALSA: timer: Unify timer callback process code

The timer core has two almost identical code for processing callbacks:
once in snd_timer_interrupt() for fast callbacks and another in
snd_timer_tasklet() for delayed callbacks.  Let's unify them.

In the new version, the resolution is read from ti->resolution at each
call, and this must be fine; ti->resolution is set in the preparation
step in snd_timer_interrupt().

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/timer.c b/sound/core/timer.c
index 61a0cec..fdcddfb 100644 (file)
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -720,29 +720,19 @@ static void snd_timer_reschedule(struct snd_timer * timer, unsigned long ticks_l
        timer->sticks = ticks;
 }
 
-/*
- * timer tasklet
- *
- */
-static void snd_timer_tasklet(unsigned long arg)
+/* call callbacks in timer ack list */
+static void snd_timer_process_callbacks(struct snd_timer *timer,
+                                       struct list_head *head)
 {
-       struct snd_timer *timer = (struct snd_timer *) arg;
        struct snd_timer_instance *ti;
-       struct list_head *p;
        unsigned long resolution, ticks;
-       unsigned long flags;
 
-       if (timer->card && timer->card->shutdown)
-               return;
-
-       spin_lock_irqsave(&timer->lock, flags);
-       /* now process all callbacks */
-       while (!list_empty(&timer->sack_list_head)) {
-               p = timer->sack_list_head.next;         /* get first item */
-               ti = list_entry(p, struct snd_timer_instance, ack_list);
+       while (!list_empty(head)) {
+               ti = list_first_entry(head, struct snd_timer_instance,
+                                     ack_list);
 
                /* remove from ack_list and make empty */
-               list_del_init(p);
+               list_del_init(&ti->ack_list);
 
                ticks = ti->pticks;
                ti->pticks = 0;
@@ -755,6 +745,22 @@ static void snd_timer_tasklet(unsigned long arg)
                spin_lock(&timer->lock);
                ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
        }
+}
+
+/*
+ * timer tasklet
+ *
+ */
+static void snd_timer_tasklet(unsigned long arg)
+{
+       struct snd_timer *timer = (struct snd_timer *) arg;
+       unsigned long flags;
+
+       if (timer->card && timer->card->shutdown)
+               return;
+
+       spin_lock_irqsave(&timer->lock, flags);
+       snd_timer_process_callbacks(timer, &timer->sack_list_head);
        spin_unlock_irqrestore(&timer->lock, flags);
 }
 
@@ -767,8 +773,8 @@ static void snd_timer_tasklet(unsigned long arg)
 void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 {
        struct snd_timer_instance *ti, *ts, *tmp;
-       unsigned long resolution, ticks;
-       struct list_head *p, *ack_list_head;
+       unsigned long resolution;
+       struct list_head *ack_list_head;
        unsigned long flags;
        int use_tasklet = 0;
 
@@ -839,23 +845,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
        }
 
        /* now process all fast callbacks */
-       while (!list_empty(&timer->ack_list_head)) {
-               p = timer->ack_list_head.next;          /* get first item */
-               ti = list_entry(p, struct snd_timer_instance, ack_list);
-
-               /* remove from ack_list and make empty */
-               list_del_init(p);
-
-               ticks = ti->pticks;
-               ti->pticks = 0;
-
-               ti->flags |= SNDRV_TIMER_IFLG_CALLBACK;
-               spin_unlock(&timer->lock);
-               if (ti->callback)
-                       ti->callback(ti, resolution, ticks);
-               spin_lock(&timer->lock);
-               ti->flags &= ~SNDRV_TIMER_IFLG_CALLBACK;
-       }
+       snd_timer_process_callbacks(timer, &timer->ack_list_head);
 
        /* do we have any slow callbacks? */
        use_tasklet = !list_empty(&timer->sack_list_head);