sched: Improve sched_request_barrier() and friends.

[paraslash.git] / alsa_write.c

diff --git a/alsa_write.c b/alsa_write.c
index 1c168e7b4b037f8e8853681e02254879f0912640..34a71f9bd34b503fafdbb192d5479c1815846b49 100644 (file)
--- a/alsa_write.c
+++ b/alsa_write.c
@@ -150,10 +150,14 @@ static void alsa_write_pre_select(struct sched *s, struct task *t)
 
        if (ret == 0)
                return;
-       if (!pad)
-               return sched_min_delay(s);
-       if (ret < 0)
-               return sched_request_barrier_or_min_delay(&pad->drain_barrier, s);
+       if (!pad) {
+               sched_min_delay(s);
+               return;
+       }
+       if (ret < 0) {
+               sched_request_barrier_or_min_delay(&pad->drain_barrier, s);
+               return;
+       }
        /*
         * Data is available to be written to the alsa handle.  Compute number
         * of milliseconds until next buffer underrun would occur.
@@ -253,7 +257,9 @@ again:
        }
        frames = bytes / pad->bytes_per_frame;
        frames = snd_pcm_writei(pad->handle, data, frames);
-       if (frames >= 0) {
+       if (frames == 0 || frames == -EAGAIN)
+               return;
+       if (frames > 0) {
                btr_consume(btrn, frames * pad->bytes_per_frame);
                goto again;
        }
@@ -262,8 +268,6 @@ again:
                snd_pcm_prepare(pad->handle);
                return;
        }
-       if (frames == -EAGAIN)
-               return;
        PARA_WARNING_LOG("%s\n", snd_strerror(-frames));
        ret = -E_ALSA_WRITE;
 err: