4 files changed, 9 insertions, 4 deletions

diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 3bc9bca771ec..13bc83ca35fb 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -271,6 +271,7 @@ struct snd_pcm_runtime {
         int overrange;
         snd_pcm_uframes_t avail_max;
         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 */
         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 255ad910077a..82d4e3329b3d 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -635,8 +635,7 @@ static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
 static inline
 snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
 {
-        snd_pcm_uframes_t ptr = runtime->status->hw_ptr;
-        return ptr - (ptr % runtime->period_size);
+        return runtime->hw_ptr_interrupt;
 }
 
 /* define extended formats in the recent OSS versions (if any) */
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index e2a817eac2a9..aa54195ef3b0 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -325,8 +325,7 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
         if (in_interrupt) {
                 /* we know that one period was processed */
                 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
-                delta = old_hw_ptr - (old_hw_ptr % runtime->period_size)
-                        + runtime->period_size;
+                delta = runtime->hw_ptr_interrupt + runtime->period_size;
                 if (delta > new_hw_ptr) {
                         hw_base += runtime->buffer_size;
                         if (hw_base >= runtime->boundary)
@@ -437,6 +436,10 @@ static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
             runtime->silence_size > 0)
                 snd_pcm_playback_silence(substream, new_hw_ptr);
 
+        if (in_interrupt) {
+                runtime->hw_ptr_interrupt = new_hw_ptr -
+                                (new_hw_ptr % runtime->period_size);
+        }
         runtime->hw_ptr_base = hw_base;
         runtime->status->hw_ptr = new_hw_ptr;
         runtime->hw_ptr_jiffies = jiffies;
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 56ec35e8510b..7a002db512b4 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1252,6 +1252,8 @@ static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
         if (err < 0)
                 return err;
         runtime->hw_ptr_base = 0;
+        runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
+                runtime->status->hw_ptr % runtime->period_size;
         runtime->silence_start = runtime->status->hw_ptr;
         runtime->silence_filled = 0;
         return 0;