ALSA: compress: Don't allow paritial drain operations on capture streams

Partial drain and next track are intended for gapless playback and
don't really have an obvious interpretation for a capture stream, so
makes sense to not allow those operations on capture streams.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 40dae72..6cf5b84 100644 (file)
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -834,6 +834,10 @@ static int snd_compr_next_track(struct snd_compr_stream *stream)
        if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
                return -EPERM;
 
+       /* next track doesn't have any meaning for capture streams */
+       if (stream->direction == SND_COMPRESS_CAPTURE)
+               return -EPERM;
+
        /* you can signal next track if this is intended to be a gapless stream
         * and current track metadata is set
         */
@@ -861,6 +865,10 @@ static int snd_compr_partial_drain(struct snd_compr_stream *stream)
                break;
        }
 
+       /* partial drain doesn't have any meaning for capture streams */
+       if (stream->direction == SND_COMPRESS_CAPTURE)
+               return -EPERM;
+
        /* stream can be drained only when next track has been signalled */
        if (stream->next_track == false)
                return -EPERM;