3 files changed, 12 insertions, 5 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index dd76cdede64..54c4ccf6fec 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -274,6 +274,7 @@ struct snd_pcm_runtime {
         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
+        unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 
         /* -- HW params -- */
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index e9d98be190c..d6ecca27bb6 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -329,11 +329,15 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
                 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
                 delta = runtime->hw_ptr_interrupt + runtime->period_size;
                 if (delta > new_hw_ptr) {
-                        hw_base += runtime->buffer_size;
-                        if (hw_base >= runtime->boundary)
-                                hw_base = 0;
-                        new_hw_ptr = hw_base + pos;
-                        goto __delta;
+                        /* check for double acknowledged interrupts */
+                        hdelta = jiffies - runtime->hw_ptr_jiffies;
+                        if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
+                                hw_base += runtime->buffer_size;
+                                if (hw_base >= runtime->boundary)
+                                        hw_base = 0;
+                                new_hw_ptr = hw_base + pos;
+                                goto __delta;
+                        }
                 }
         }
         /* new_hw_ptr might be lower than old_hw_ptr in case when */
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 303ac04ff6e..2d2e1b65ee9 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -867,6 +867,8 @@ static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
         struct snd_pcm_runtime *runtime = substream->runtime;
         snd_pcm_trigger_tstamp(substream);
         runtime->hw_ptr_jiffies = jiffies;
+        runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 
+                                                            runtime->rate;
         runtime->status->state = state;
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
             runtime->silence_size > 0)