ALSA: pcm - Fix regressions with VMware

VMware tends to report PCM positions and period updates at utterly
wrong timing.  This screws up the recent PCM core code that tries
to correct the position based on the irq timing.

Now, when a backward irq position is detected, skip the update
instead of rebasing.  (This is almost the old behavior before
2.6.30.)

Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 333e4dd29450c7e9e823ebec46b7af4bcb6c62fc..3b673e2f991d67b609f9c712cc4281a8cffc5111 100644 (file)
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -244,18 +244,27 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
                        delta = new_hw_ptr - hw_ptr_interrupt;
        }
        if (delta < 0) {
-               delta += runtime->buffer_size;
+               if (runtime->periods == 1)
+                       delta += runtime->buffer_size;
                if (delta < 0) {
                        hw_ptr_error(substream, 
                                     "Unexpected hw_pointer value "
                                     "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
                                     substream->stream, (long)pos,
                                     (long)hw_ptr_interrupt);
+#if 1
+                       /* simply skipping the hwptr update seems more
+                        * robust in some cases, e.g. on VMware with
+                        * inaccurate timer source
+                        */
+                       return 0; /* skip this update */
+#else
                        /* rebase to interrupt position */
                        hw_base = new_hw_ptr = hw_ptr_interrupt;
                        /* align hw_base to buffer_size */
                        hw_base -= hw_base % runtime->buffer_size;
                        delta = 0;
+#endif
                } else {
                        hw_base += runtime->buffer_size;
                        if (hw_base >= runtime->boundary)