linux-kernel - Re: [sound] mpd loops on current -next

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Date:	Sun, 07 Jun 2009 12:28:41 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Jaroslav Kysela <perex@...ex.cz>
Cc:	Jiri Slaby <jirislaby@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [sound] mpd loops on current -next

At Sat, 06 Jun 2009 18:37:11 +0200,
I wrote:
> 
> At Sat, 6 Jun 2009 17:52:44 +0200 (CEST),
> Jaroslav Kysela wrote:
> > 
> > On Sat, 6 Jun 2009, Jiri Slaby wrote:
> > 
> > > Hi,
> > >
> > > I found a regression in current -next caused by
> > > c44941e05900fe85f6091456f9e313b446a97ae9
> > > (PCM midlevel: Do not update hw_ptr_jiffies when hw_ptr is not changed)
> > 
> > Oops. It seems like typo. Could you try this patch, please?
> 
> Ah, that's the cause of the bug with PA on the recent driver.
> I didn't experience the problem because I myself don't use PA :)

I found another bug with that change.  The fix is attached below.


Takashi

===
>From ab1863fc9bc18c806338564124b1e5e7e3ef53d1 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@...e.de>
Date: Sun, 7 Jun 2009 12:09:17 +0200
Subject: [PATCH] ALSA: pcm - Fix update of runtime->hw_ptr_interrupt

The commit 13f040f9e55d41e92e485389123654971e03b819 made another
regression, the missing update of runtime->hw_ptr_interrupt.
Since this field is only checked in snd_pcmupdate__hw_ptr_interrupt(),
not in snd_pcm_update_hw_ptr(), it must be updated before the hw_ptr
change check.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 sound/core/pcm_lib.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index bf34603..adb306f 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -299,6 +299,8 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 		hw_ptr_interrupt =
 			new_hw_ptr - new_hw_ptr % runtime->period_size;
 	}
+	runtime->hw_ptr_interrupt = hw_ptr_interrupt;
+
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 	    runtime->silence_size > 0)
 		snd_pcm_playback_silence(substream, new_hw_ptr);
@@ -309,7 +311,6 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 	runtime->hw_ptr_base = hw_base;
 	runtime->status->hw_ptr = new_hw_ptr;
 	runtime->hw_ptr_jiffies = jiffies;
-	runtime->hw_ptr_interrupt = hw_ptr_interrupt;
 	if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 		snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 
-- 
1.6.3.2


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