Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

[karo-tx-linux.git] / sound / core / pcm_lib.c

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index e23e0e7ab26f9ff5f02204ca62422a14cc674e5e..a1707cca9c6635c8b4cd7e79b5cebe21bffc2d9e 100644 (file)
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -334,11 +334,15 @@ 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 */