ALSA: line6: Consolidate PCM stream buffer allocation and free

The PCM stream buffer allocation and free are identical for both
playback and capture streams.  Provide single helper functions.
These are used only in pcm.c, thus they can be even static.

Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 29 insertions, 24 deletions

diff --git a/sound/usb/line6/pcm.c b/sound/usb/line6/pcm.c
index 4152d92..f758259 100644
--- a/sound/usb/line6/pcm.c
+++ b/sound/usb/line6/pcm.c
@@ -132,6 +132,27 @@ static void line6_wait_clear_audio_urbs(struct snd_line6_pcm *line6pcm,
 			"timeout: still %d active urbs..\n", alive);
 }
 
+static int line6_alloc_stream_buffer(struct snd_line6_pcm *line6pcm,
+				     struct line6_pcm_stream *pcms)
+{
+	/* Invoked multiple times in a row so allocate once only */
+	if (pcms->buffer)
+		return 0;
+
+	pcms->buffer = kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
+			       line6pcm->max_packet_size, GFP_KERNEL);
+	if (!pcms->buffer)
+		return -ENOMEM;
+	return 0;
+}
+
+static void line6_free_stream_buffer(struct snd_line6_pcm *line6pcm,
+				     struct line6_pcm_stream *pcms)
+{
+	kfree(pcms->buffer);
+	pcms->buffer = NULL;
+}
+
 static bool test_flags(unsigned long flags0, unsigned long flags1,
 		       unsigned long mask)
 {
@@ -153,17 +174,9 @@ int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
 	line6pcm->prev_fbuf = NULL;
 
 	if (test_flags(flags_old, flags_new, LINE6_BITS_CAPTURE_BUFFER)) {
-		/* Invoked multiple times in a row so allocate once only */
-		if (!line6pcm->in.buffer) {
-			line6pcm->in.buffer =
-				kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
-					line6pcm->max_packet_size, GFP_KERNEL);
-			if (!line6pcm->in.buffer) {
-				err = -ENOMEM;
-				goto pcm_acquire_error;
-			}
-		}
-
+		err = line6_alloc_stream_buffer(line6pcm, &line6pcm->in);
+		if (err < 0)
+			goto pcm_acquire_error;
 		flags_final |= channels & LINE6_BITS_CAPTURE_BUFFER;
 	}
 
@@ -190,17 +203,9 @@ int line6_pcm_acquire(struct snd_line6_pcm *line6pcm, int channels)
 	}
 
 	if (test_flags(flags_old, flags_new, LINE6_BITS_PLAYBACK_BUFFER)) {
-		/* Invoked multiple times in a row so allocate once only */
-		if (!line6pcm->out.buffer) {
-			line6pcm->out.buffer =
-				kmalloc(LINE6_ISO_BUFFERS * LINE6_ISO_PACKETS *
-					line6pcm->max_packet_size, GFP_KERNEL);
-			if (!line6pcm->out.buffer) {
-				err = -ENOMEM;
-				goto pcm_acquire_error;
-			}
-		}
-
+		err = line6_alloc_stream_buffer(line6pcm, &line6pcm->out);
+		if (err < 0)
+			goto pcm_acquire_error;
 		flags_final |= channels & LINE6_BITS_PLAYBACK_BUFFER;
 	}
 
@@ -248,7 +253,7 @@ int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels)
 
 	if (test_flags(flags_new, flags_old, LINE6_BITS_CAPTURE_BUFFER)) {
 		line6_wait_clear_audio_urbs(line6pcm, &line6pcm->in);
-		line6_free_capture_buffer(line6pcm);
+		line6_free_stream_buffer(line6pcm, &line6pcm->in);
 	}
 
 	if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_STREAM))
@@ -256,7 +261,7 @@ int line6_pcm_release(struct snd_line6_pcm *line6pcm, int channels)
 
 	if (test_flags(flags_new, flags_old, LINE6_BITS_PLAYBACK_BUFFER)) {
 		line6_wait_clear_audio_urbs(line6pcm, &line6pcm->out);
-		line6_free_playback_buffer(line6pcm);
+		line6_free_stream_buffer(line6pcm, &line6pcm->out);
 	}
 
 	return 0;