audiod: Don't init slot info unless opening the receiver succeeds.

Currently we set the slot's audio format number even if the receiver could not
be opened. This confuses the slot clearing code as no writer is active in
this case which triggers the assertion

	para_audiod: audiod.c:384: close_writers: Assertion `s->wns'

Fix it by not touching the slot info structure unless we have successfully started
the receiver. Also perform some minor cleanups while we're at it.

Thanks to Gerrit Renker for pointing out this bug.

diff --git a/audiod.c b/audiod.c
index 1663dad3d88e8bb90ec69e2f7cffa1bcbd2ce64e..76a6af64e00e6c5b9527cd3eff03d7ce285071e2 100644 (file)
--- a/audiod.c
+++ b/audiod.c
@@ -549,16 +549,13 @@ static int open_receiver(int format)
        int ret, slot_num;
        struct receiver *r = a->receiver;
        struct receiver_node *rn;
-       const struct timeval restart_delay = {2, 0};
 
+       tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
        ret = get_empty_slot();
        if (ret < 0)
-               goto err;
+               return ret;
        slot_num = ret;
-       s = &slot[slot_num];
-       s->format = format;
-       s->receiver_node = para_calloc(sizeof(struct receiver_node));
-       rn = s->receiver_node;
+       rn = para_calloc(sizeof(*rn));
        rn->receiver = r;
        rn->conf = a->receiver_conf;
        rn->btrn = btr_new_node(&(struct btr_node_description)
@@ -567,21 +564,18 @@ static int open_receiver(int format)
        if (ret < 0) {
                btr_free_node(rn->btrn);
                free(rn);
-               s->receiver_node = NULL;
-               goto err;
+               return ret;
        }
+       s = &slot[slot_num];
+       s->format = format;
+       s->receiver_node = rn;
        PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
-               audio_formats[s->format], r->name, slot_num);
+               audio_formats[format], r->name, slot_num);
        rn->task.pre_select = r->pre_select;
        rn->task.post_select = r->post_select;
        sprintf(rn->task.status, "%s receiver node", r->name);
        register_task(&rn->task);
-       ret = slot_num;
-err:
-       if (ret < 0)
-               PARA_ERROR_LOG("%s\n", para_strerror(-ret));
-       tv_add(now, &restart_delay, &afi[format].restart_barrier);
-       return ret;
+       return slot_num;
 }
 
 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
@@ -1142,8 +1136,10 @@ static void start_stop_decoders(void)
        if (!must_start_decoder())
                return;
        ret = open_receiver(stat_task->current_audio_format_num);
-       if (ret < 0)
+       if (ret < 0) {
+               PARA_ERROR_LOG("%s\n", para_strerror(-ret));
                return;
+       }
        sl = slot + ret;
        a = afi + sl->format;
        if (a->num_filters)