1 files changed, 23 insertions, 9 deletions

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index d9c96353121a..255ad910077a 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -632,6 +632,13 @@ static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)
         return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_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);
+}
+
 /* define extended formats in the recent OSS versions (if any) */
 /* linear formats */
 #define AFMT_S32_LE      0x00001000
@@ -1102,7 +1109,7 @@ static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)
                 return err;
         }
         runtime->oss.prepare = 0;
-        runtime->oss.prev_hw_ptr_interrupt = 0;
+        runtime->oss.prev_hw_ptr_period = 0;
         runtime->oss.period_ptr = 0;
         runtime->oss.buffer_used = 0;
 
@@ -1950,7 +1957,8 @@ static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)
         return result;
 }
 
-static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream, snd_pcm_uframes_t hw_ptr)
+static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
+                                      snd_pcm_uframes_t hw_ptr)
 {
         struct snd_pcm_runtime *runtime = substream->runtime;
         snd_pcm_uframes_t appl_ptr;
@@ -1986,7 +1994,8 @@ static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int tr
                         if (runtime->oss.trigger)
                                 goto _skip1;
                         if (atomic_read(&psubstream->mmap_count))
-                                snd_pcm_oss_simulate_fill(psubstream, runtime->hw_ptr_interrupt);
+                                snd_pcm_oss_simulate_fill(psubstream,
+                                                get_hw_ptr_period(runtime));
                         runtime->oss.trigger = 1;
                         runtime->start_threshold = 1;
                         cmd = SNDRV_PCM_IOCTL_START;
@@ -2105,11 +2114,12 @@ static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream
         info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);
         if (atomic_read(&substream->mmap_count)) {
                 snd_pcm_sframes_t n;
-                n = (delay = runtime->hw_ptr_interrupt) - runtime->oss.prev_hw_ptr_interrupt;
+                delay = get_hw_ptr_period(runtime);
+                n = delay - runtime->oss.prev_hw_ptr_period;
                 if (n < 0)
                         n += runtime->boundary;
                 info.blocks = n / runtime->period_size;
-                runtime->oss.prev_hw_ptr_interrupt = delay;
+                runtime->oss.prev_hw_ptr_period = delay;
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                         snd_pcm_oss_simulate_fill(substream, delay);
                 info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
@@ -2673,18 +2683,22 @@ static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)
 {
         struct snd_pcm_runtime *runtime = substream->runtime;
         if (atomic_read(&substream->mmap_count))
-                return runtime->oss.prev_hw_ptr_interrupt != runtime->hw_ptr_interrupt;
+                return runtime->oss.prev_hw_ptr_period !=
+                                                get_hw_ptr_period(runtime);
         else
-                return snd_pcm_playback_avail(runtime) >= runtime->oss.period_frames;
+                return snd_pcm_playback_avail(runtime) >=
+                                                runtime->oss.period_frames;
 }
 
 static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)
 {
         struct snd_pcm_runtime *runtime = substream->runtime;
         if (atomic_read(&substream->mmap_count))
-                return runtime->oss.prev_hw_ptr_interrupt != runtime->hw_ptr_interrupt;
+                return runtime->oss.prev_hw_ptr_period !=
+                                                get_hw_ptr_period(runtime);
         else
-                return snd_pcm_capture_avail(runtime) >= runtime->oss.period_frames;
+                return snd_pcm_capture_avail(runtime) >=
+                                                runtime->oss.period_frames;
 }
 
 static unsigned int snd_pcm_oss_poll(struct file *file, poll_table * wait)