ALSA: intel8x0 - Fix PCM position craziness

The PCM pointer callback sometimes returns invalid positions and this
screws up the hw_ptr updater in PCM core.  Especially since now the
jiffies check is optional with xrun_debug, the invalid position is
handled as is, and causes serious sound skips, etc.

This patch simplifies the position-fix strategy in intel8x0 to be more
robust:
- just falls back to the last position if bogus position is detected
- another sanity check for the backward move of the position due to
  a race of register update and the base-index update

This patch is applicable also for 2.6.30.

Tested-by: David Miller <davem@davemloft.net>
Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index 173bebf..8aa5687 100644 (file)
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -356,8 +356,6 @@ struct ichdev {
         unsigned int position;
        unsigned int pos_shift;
        unsigned int last_pos;
-       unsigned long last_pos_jiffies;
-       unsigned int jiffy_to_bytes;
         int frags;
         int lvi;
         int lvi_frag;
@@ -844,7 +842,6 @@ static int snd_intel8x0_pcm_trigger(struct snd_pcm_substream *substream, int cmd
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
                val = ICH_IOCE | ICH_STARTBM;
                ichdev->last_pos = ichdev->position;
-               ichdev->last_pos_jiffies = jiffies;
                break;
        case SNDRV_PCM_TRIGGER_SUSPEND:
                ichdev->suspended = 1;
@@ -1048,7 +1045,6 @@ static int snd_intel8x0_pcm_prepare(struct snd_pcm_substream *substream)
                        ichdev->pos_shift = (runtime->sample_bits > 16) ? 2 : 1;
        }
        snd_intel8x0_setup_periods(chip, ichdev);
-       ichdev->jiffy_to_bytes = (runtime->rate * 4 * ichdev->pos_shift) / HZ;
        return 0;
 }
 
@@ -1073,19 +1069,23 @@ static snd_pcm_uframes_t snd_intel8x0_pcm_pointer(struct snd_pcm_substream *subs
                    ptr1 == igetword(chip, ichdev->reg_offset + ichdev->roff_picb))
                        break;
        } while (timeout--);
+       ptr = ichdev->last_pos;
        if (ptr1 != 0) {
                ptr1 <<= ichdev->pos_shift;
                ptr = ichdev->fragsize1 - ptr1;
                ptr += position;
-               ichdev->last_pos = ptr;
-               ichdev->last_pos_jiffies = jiffies;
-       } else {
-               ptr1 = jiffies - ichdev->last_pos_jiffies;
-               if (ptr1)
-                       ptr1 -= 1;
-               ptr = ichdev->last_pos + ptr1 * ichdev->jiffy_to_bytes;
-               ptr %= ichdev->size;
+               if (ptr < ichdev->last_pos) {
+                       unsigned int pos_base, last_base;
+                       pos_base = position / ichdev->fragsize1;
+                       last_base = ichdev->last_pos / ichdev->fragsize1;
+                       /* another sanity check; ptr1 can go back to full
+                        * before the base position is updated
+                        */
+                       if (pos_base == last_base)
+                               ptr = ichdev->last_pos;
+               }
        }
+       ichdev->last_pos = ptr;
        spin_unlock(&chip->reg_lock);
        if (ptr >= ichdev->size)
                return 0;