[PATCH 4/4] ALSA: pcm: Use for_each_pcm_substream() macro

[Takashi Iwai]

There are a few places doing the same loop iterating all PCM
substreams belonging to the PCM object.  Introduce a local helper
macro, for_each_pcm_substream(), to simplify the code.

Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/core/pcm.c        | 29 +++++++++++++----------------
 sound/core/pcm_local.h  |  6 ++++++
 sound/core/pcm_memory.c | 12 ++++--------
 sound/core/pcm_native.c | 35 +++++++++++++++--------------------
 4 files changed, 38 insertions(+), 44 deletions(-)

diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index 50eb29fcdfe7..b163164a83ec 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -1095,25 +1095,22 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
 	mutex_lock(&pcm->open_mutex);
 	wake_up(&pcm->open_wait);
 	list_del_init(&pcm->list);
-	for (cidx = 0; cidx < 2; cidx++) {
-		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
-			snd_pcm_stream_lock_irq(substream);
-			if (substream->runtime) {
-				if (snd_pcm_running(substream))
-					snd_pcm_stop(substream,
-						     SNDRV_PCM_STATE_DISCONNECTED);
-				/* to be sure, set the state unconditionally */
-				substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
-				wake_up(&substream->runtime->sleep);
-				wake_up(&substream->runtime->tsleep);
-			}
-			snd_pcm_stream_unlock_irq(substream);
+
+	for_each_pcm_substream(pcm, cidx, substream) {
+		snd_pcm_stream_lock_irq(substream);
+		if (substream->runtime) {
+			if (snd_pcm_running(substream))
+				snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
+			/* to be sure, set the state unconditionally */
+			substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
+			wake_up(&substream->runtime->sleep);
+			wake_up(&substream->runtime->tsleep);
 		}
+		snd_pcm_stream_unlock_irq(substream);
 	}
 
-	for (cidx = 0; cidx < 2; cidx++)
-		for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
-			snd_pcm_sync_stop(substream, false);
+	for_each_pcm_substream(pcm, cidx, substream)
+		snd_pcm_sync_stop(substream, false);
 
 	pcm_call_notify(pcm, n_disconnect);
 	for (cidx = 0; cidx < 2; cidx++) {
diff --git a/sound/core/pcm_local.h b/sound/core/pcm_local.h
index b3e8be5aeafb..e3b3558aeab6 100644
--- a/sound/core/pcm_local.h
+++ b/sound/core/pcm_local.h
@@ -72,4 +72,10 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 
 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
 
+/* loop over all PCM substreams */
+#define for_each_pcm_substream(pcm, str, subs) \
+	for ((str) = 0; (str) < 2; (str)++) \
+		for ((subs) = (pcm)->streams[str].substream; (subs); \
+		     (subs) = (subs)->next)
+
 #endif	/* __SOUND_CORE_PCM_LOCAL_H */
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index ee6e9c5eec45..289dd1fd8fe7 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -111,9 +111,8 @@ void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm)
 	struct snd_pcm_substream *substream;
 	int stream;
 
-	for (stream = 0; stream < 2; stream++)
-		for (substream = pcm->streams[stream].substream; substream; substream = substream->next)
-			snd_pcm_lib_preallocate_free(substream);
+	for_each_pcm_substream(pcm, stream, substream)
+		snd_pcm_lib_preallocate_free(substream);
 }
 EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
 
@@ -246,11 +245,8 @@ static void preallocate_pages_for_all(struct snd_pcm *pcm, int type,
 	struct snd_pcm_substream *substream;
 	int stream;
 
-	for (stream = 0; stream < 2; stream++)
-		for (substream = pcm->streams[stream].substream; substream;
-		     substream = substream->next)
-			preallocate_pages(substream, type, data, size, max,
-					  managed);
+	for_each_pcm_substream(pcm, stream, substream)
+		preallocate_pages(substream, type, data, size, max, managed);
 }
 
 /**
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 0ae2475465ab..17a85f4815d5 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1674,30 +1674,25 @@ int snd_pcm_suspend_all(struct snd_pcm *pcm)
 	if (! pcm)
 		return 0;
 
-	for (stream = 0; stream < 2; stream++) {
-		for (substream = pcm->streams[stream].substream;
-		     substream; substream = substream->next) {
-			/* FIXME: the open/close code should lock this as well */
-			if (substream->runtime == NULL)
-				continue;
+	for_each_pcm_substream(pcm, stream, substream) {
+		/* FIXME: the open/close code should lock this as well */
+		if (!substream->runtime)
+			continue;
 
-			/*
-			 * Skip BE dai link PCM's that are internal and may
-			 * not have their substream ops set.
-			 */
-			if (!substream->ops)
-				continue;
+		/*
+		 * Skip BE dai link PCM's that are internal and may
+		 * not have their substream ops set.
+		 */
+		if (!substream->ops)
+			continue;
 
-			err = snd_pcm_suspend(substream);
-			if (err < 0 && err != -EBUSY)
-				return err;
-		}
+		err = snd_pcm_suspend(substream);
+		if (err < 0 && err != -EBUSY)
+			return err;
 	}
 
-	for (stream = 0; stream < 2; stream++)
-		for (substream = pcm->streams[stream].substream;
-		     substream; substream = substream->next)
-			snd_pcm_sync_stop(substream, false);
+	for_each_pcm_substream(pcm, stream, substream)
+		snd_pcm_sync_stop(substream, false);
 
 	return 0;
 }
-- 
2.26.2