ALSA: pcm: use exit controlled loop in snd_pcm_playback_silence()

We already know that `frames` is greater than zero, because we just
checked it. So we don't need to check the loop condition on the first
iteration.

Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Link: https://lore.kernel.org/r/20230505155244.2312199-7-oswald.buddenhagen@gmx.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 17fc80a..9c121a9 100644 (file)
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -123,14 +123,14 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
        if (frames == 0)
                return;
        ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
-       while (frames > 0) {
+       do {
                transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
                err = fill_silence_frames(substream, ofs, transfer);
                snd_BUG_ON(err < 0);
                runtime->silence_filled += transfer;
                frames -= transfer;
                ofs = 0;
-       }
+       } while (frames > 0);
        snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
 }