ALSA: pcm: Unify snd_pcm_delay() and snd_pcm_hwsync()

Both snd_pcm_delay() and snd_pcm_hwsync() do the almost same thing.
The only difference is that the former calculate the delay, so unify
them as a code cleanup, and treat NULL delay argument only for hwsync
operation.

Also, the patch does a slight code refactoring in snd_pcm_delay().
The initialization of the delay value is done in the caller side now.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211014145323.26506-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 46c643d..627b201 100644 (file)
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -2932,32 +2932,24 @@ static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream,
        return ret;
 }
 
-static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
-{
-       int err;
-
-       snd_pcm_stream_lock_irq(substream);
-       err = do_pcm_hwsync(substream);
-       snd_pcm_stream_unlock_irq(substream);
-       return err;
-}
-               
 static int snd_pcm_delay(struct snd_pcm_substream *substream,
                         snd_pcm_sframes_t *delay)
 {
        int err;
-       snd_pcm_sframes_t n = 0;
 
        snd_pcm_stream_lock_irq(substream);
        err = do_pcm_hwsync(substream);
-       if (!err)
-               n = snd_pcm_calc_delay(substream);
+       if (delay && !err)
+               *delay = snd_pcm_calc_delay(substream);
        snd_pcm_stream_unlock_irq(substream);
-       if (!err)
-               *delay = n;
        return err;
 }
                
+static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
+{
+       return snd_pcm_delay(substream, NULL);
+}
+
 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
                            struct snd_pcm_sync_ptr __user *_sync_ptr)
 {
@@ -3275,7 +3267,7 @@ static int snd_pcm_common_ioctl(struct file *file,
                return snd_pcm_hwsync(substream);
        case SNDRV_PCM_IOCTL_DELAY:
        {
-               snd_pcm_sframes_t delay;
+               snd_pcm_sframes_t delay = 0;
                snd_pcm_sframes_t __user *res = arg;
                int err;