ALSA: pcm_dmaengine: Unify two close functions

Both snd_dmaengine_pcm_close() and
snd_dmaengine_pcm_close_release_chan() are almost identical except for
a call of dma_release_channel() in the latter.  For code
simplification, unify them internally.

Just a code refactoring, and no functional changes.

Link: https://patch.msgid.link/20240625113356.2123-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/pcm_dmaengine.c

@@ -349,13 +349,8 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
 }
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
 
-/**
- * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
- * @substream: PCM substream
- *
- * Return: 0 on success, a negative error code otherwise
- */
-int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
+static void __snd_dmaengine_pcm_close(struct snd_pcm_substream *substream,
+				      bool release_channel)
 {
 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
 	struct dma_tx_state state;
@@ -366,8 +361,20 @@ int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
 		dmaengine_terminate_async(prtd->dma_chan);
 
 	dmaengine_synchronize(prtd->dma_chan);
+	if (release_channel)
+		dma_release_channel(prtd->dma_chan);
 	kfree(prtd);
+}
 
+/**
+ * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
+ * @substream: PCM substream
+ *
+ * Return: 0 on success, a negative error code otherwise
+ */
+int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
+{
+	__snd_dmaengine_pcm_close(substream, false);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
@@ -383,18 +390,7 @@ EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close);
  */
 int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
 {
-	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
-	struct dma_tx_state state;
-	enum dma_status status;
-
-	status = dmaengine_tx_status(prtd->dma_chan, prtd->cookie, &state);
-	if (status == DMA_PAUSED)
-		dmaengine_terminate_async(prtd->dma_chan);
-
-	dmaengine_synchronize(prtd->dma_chan);
-	dma_release_channel(prtd->dma_chan);
-	kfree(prtd);
-
+	__snd_dmaengine_pcm_close(substream, true);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_close_release_chan);