audio: remove unnecessary calls to put_buffer_in

This patch removes unnecessary calls to the pcm_ops function
put_buffer_in(). No audio backend needs this call if the
returned length of pcm_ops function get_buffer_in() is zero.

For the DirectSound backend this prevents a call to
dsound_unlock_in() without a preceding call to dsound_lock_in().
While Windows doesn't complain it seems wrong anyway.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 20200920171729.15861-5-vr_qemu@t-online.de
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

1 files changed, 0 insertions, 2 deletions

diff --git a/audio/audio.c b/audio/audio.c
index 5c47a03602..341edc4d00 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1261,7 +1261,6 @@ static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples)
 
         assert(size % hw->info.bytes_per_frame == 0);
         if (size == 0) {
-            hw->pcm_ops->put_buffer_in(hw, buf, size);
             break;
         }
 
@@ -1502,7 +1501,6 @@ size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size)
         void *src = hw->pcm_ops->get_buffer_in(hw, &src_size);
 
         if (src_size == 0) {
-            hw->pcm_ops->put_buffer_in(hw, src, src_size);
             break;
         }