From a70ab8a8645083f3700814e757f2940a88b7ef88 Mon Sep 17 00:00:00 2001
From: Charles Keepax <ckeepax@opensource.cirrus.com>
Date: Mon, 22 Jul 2019 10:24:35 +0100
Subject: [PATCH] ALSA: compress: Don't allow paritial drain operations on capture streams
Git-commit: a70ab8a8645083f3700814e757f2940a88b7ef88
Patch-mainline: v5.3-rc2
References: bsc#1051510
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>
---
sound/core/compress_offload.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 40dae723c59d..6cf5b8440cf3 100644
--- 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;
--
2.16.4