ALSA: aloop: Fix random zeros in capture data when using jiffies timer

commit 3e48940abee88b8dbbeeaf8a07e7b2b6be1271b3 upstream.

In loopback_jiffies_timer_pos_update(), we are getting jiffies twice.
First time for playback, second time for capture. Jiffies can be updated
between these two calls and if the capture jiffies is larger, extra zeros
will be filled in the capture buffer.

Change to get jiffies once and use it for both playback and capture.

Signed-off-by: Pattara Teerapong <pteerapong@chromium.org>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220901144036.4049060-1-pteerapong@chromium.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index 452b9eaca815b72da837a164b8a75bc1bb8f26ea..474347aba50e60a28353620dbfb7ed7d1aac79a1 100644 (file)
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -463,17 +463,18 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
                        cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
        struct loopback_pcm *dpcm_capt =
                        cable->streams[SNDRV_PCM_STREAM_CAPTURE];
-       unsigned long delta_play = 0, delta_capt = 0;
+       unsigned long delta_play = 0, delta_capt = 0, cur_jiffies;
        unsigned int running, count1, count2;
 
+       cur_jiffies = jiffies;
        running = cable->running ^ cable->pause;
        if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
-               delta_play = jiffies - dpcm_play->last_jiffies;
+               delta_play = cur_jiffies - dpcm_play->last_jiffies;
                dpcm_play->last_jiffies += delta_play;
        }
 
        if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
-               delta_capt = jiffies - dpcm_capt->last_jiffies;
+               delta_capt = cur_jiffies - dpcm_capt->last_jiffies;
                dpcm_capt->last_jiffies += delta_capt;
        }