sound: usb-audio: use normal number of frames for no-data URBs

When sending a silence URB (before playback has started, or when it is
paused), use the number of frames that would be normally sent instead of
a single frame so that the rate at which completion interrupts arrive is
consistent.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index c709b95..417d557 100644 (file)
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -525,7 +525,7 @@ static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs)
 /*
  * Prepare urb for streaming before playback starts or when paused.
  *
- * We don't have any data, so we send a frame of silence.
+ * We don't have any data, so we send silence.
  */
 static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
                                       struct snd_pcm_runtime *runtime,
@@ -537,13 +537,13 @@ static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
 
        offs = 0;
        urb->dev = ctx->subs->dev;
-       urb->number_of_packets = subs->packs_per_ms;
-       for (i = 0; i < subs->packs_per_ms; ++i) {
+       for (i = 0; i < ctx->packets; ++i) {
                counts = snd_usb_audio_next_packet_size(subs);
                urb->iso_frame_desc[i].offset = offs * stride;
                urb->iso_frame_desc[i].length = counts * stride;
                offs += counts;
        }
+       urb->number_of_packets = ctx->packets;
        urb->transfer_buffer_length = offs * stride;
        memset(urb->transfer_buffer,
               subs->cur_audiofmt->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0,