linux-kernel - [PATCH 3.16 103/202] ALSA: compress: Fix stop handling on compressed capture streams

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Message-ID: <lsq.1556377989.315784436@decadent.org.uk>
Date:   Sat, 27 Apr 2019 16:13:09 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Takashi Iwai" <tiwai@...e.de>,
        "Charles Keepax" <ckeepax@...nsource.cirrus.com>
Subject: [PATCH 3.16 103/202] ALSA: compress: Fix stop handling on
 compressed capture streams

3.16.66-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Charles Keepax <ckeepax@...nsource.cirrus.com>

commit 4f2ab5e1d13d6aa77c55f4914659784efd776eb4 upstream.

It is normal user behaviour to start, stop, then start a stream
again without closing it. Currently this works for compressed
playback streams but not capture ones.

The states on a compressed capture stream go directly from OPEN to
PREPARED, unlike a playback stream which moves to SETUP and waits
for a write of data before moving to PREPARED. Currently however,
when a stop is sent the state is set to SETUP for both types of
streams. This leaves a capture stream in the situation where a new
start can't be sent as that requires the state to be PREPARED and
a new set_params can't be sent as that requires the state to be
OPEN. The only option being to close the stream, and then reopen.

Correct this issues by allowing snd_compr_drain_notify to set the
state depending on the stream direction, as we already do in
set_params.

Fixes: 49bb6402f1aa ("ALSA: compress_core: Add support for capture streams")
Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/sound/compress_driver.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/include/sound/compress_driver.h
+++ b/include/sound/compress_driver.h
@@ -176,7 +176,11 @@ static inline void snd_compr_drain_notif
 	if (snd_BUG_ON(!stream))
 		return;

-	stream->runtime->state = SNDRV_PCM_STATE_SETUP;
+	if (stream->direction == SND_COMPRESS_PLAYBACK)
+		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
+	else
+		stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
+
 	wake_up(&stream->runtime->sleep);
 }