linux-kernel - [PATCH 03/10] ALSA: aloop: loopback_timer

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Date:   Mon, 25 Mar 2019 17:00:37 +0100
From:   <twischer@...adit-jv.com>
To:     <patch@...a-project.org>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        Timo Wischer <twischer@...adit-jv.com>
Subject: [PATCH 03/10] ALSA: aloop: loopback_timer_stop: Support return of error code

From: Timo Wischer <twischer@...adit-jv.com>

This is required for additional timer implementations which could detect
errors and want to throw them.

Signed-off-by: Timo Wischer <twischer@...adit-jv.com>
---
 sound/drivers/aloop.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index f0c7b5b..11e8ed6 100644
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -190,15 +190,19 @@ static int loopback_timer_start(struct loopback_pcm *dpcm)
 }
 
 /* call in cable->lock */
-static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
+static inline int loopback_timer_stop(struct loopback_pcm *dpcm)
 {
 	del_timer(&dpcm->timer);
 	dpcm->timer.expires = 0;
+
+	return 0;
 }
 
-static inline void loopback_timer_stop_sync(struct loopback_pcm *dpcm)
+static inline int loopback_timer_stop_sync(struct loopback_pcm *dpcm)
 {
 	del_timer_sync(&dpcm->timer);
+
+	return 0;
 }
 
 #define CABLE_VALID_PLAYBACK	(1 << SNDRV_PCM_STREAM_PLAYBACK)
@@ -289,7 +293,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
 		spin_lock(&cable->lock);	
 		cable->running &= ~stream;
 		cable->pause &= ~stream;
-		loopback_timer_stop(dpcm);
+		err = loopback_timer_stop(dpcm);
 		spin_unlock(&cable->lock);
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			loopback_active_notify(dpcm);
@@ -298,7 +302,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 		spin_lock(&cable->lock);	
 		cable->pause |= stream;
-		loopback_timer_stop(dpcm);
+		err = loopback_timer_stop(dpcm);
 		spin_unlock(&cable->lock);
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 			loopback_active_notify(dpcm);
@@ -337,9 +341,11 @@ static int loopback_prepare(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct loopback_pcm *dpcm = runtime->private_data;
 	struct loopback_cable *cable = dpcm->cable;
-	int bps, salign;
+	int err, bps, salign;
 
-	loopback_timer_stop_sync(dpcm);
+	err = loopback_timer_stop_sync(dpcm);
+	if (err < 0)
+		return err;
 
 	salign = (snd_pcm_format_width(runtime->format) *
 						runtime->channels) / 8;
-- 
2.7.4