ALSA: USB-audio: Break out copying to urb from prepare_playback_urb()

Refactoring in preparation for adding Zoom R16/24 quirk.
No functional change.

Signed-off-by: Ricard Wanderlof <ricardw@axis.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index cdac5179db3f349f8ac61e010a8a9ff05c2e93ae..4292bad9f3202e1e0fa635b6a48523c3647e1a4e 100644 (file)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1385,6 +1385,26 @@ static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
        }
 }
 
+static void copy_to_urb(struct snd_usb_substream *subs,
+                      struct urb *urb, int stride, unsigned int bytes)
+{
+       struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+
+       if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
+               /* err, the transferred area goes over buffer boundary. */
+               unsigned int bytes1 =
+                       runtime->buffer_size * stride - subs->hwptr_done;
+               memcpy(urb->transfer_buffer,
+                      runtime->dma_area + subs->hwptr_done, bytes1);
+               memcpy(urb->transfer_buffer + bytes1,
+                      runtime->dma_area, bytes - bytes1);
+       } else {
+               memcpy(urb->transfer_buffer,
+                      runtime->dma_area + subs->hwptr_done, bytes);
+       }
+       subs->hwptr_done += bytes;
+}
+
 static void prepare_playback_urb(struct snd_usb_substream *subs,
                                 struct urb *urb)
 {
@@ -1462,20 +1482,7 @@ static void prepare_playback_urb(struct snd_usb_substream *subs,
                subs->hwptr_done += bytes;
        } else {
                /* usual PCM */
-               if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
-                       /* err, the transferred area goes over buffer boundary. */
-                       unsigned int bytes1 =
-                               runtime->buffer_size * stride - subs->hwptr_done;
-                       memcpy(urb->transfer_buffer,
-                              runtime->dma_area + subs->hwptr_done, bytes1);
-                       memcpy(urb->transfer_buffer + bytes1,
-                              runtime->dma_area, bytes - bytes1);
-               } else {
-                       memcpy(urb->transfer_buffer,
-                              runtime->dma_area + subs->hwptr_done, bytes);
-               }
-
-               subs->hwptr_done += bytes;
+               copy_to_urb(subs, urb, stride, bytes);
        }
 
        if (subs->hwptr_done >= runtime->buffer_size * stride)