lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <s5hzlcedxqn.wl%tiwai@suse.de>
Date:	Fri, 12 Jun 2009 03:52:48 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Sven Köhler <sven.koehler@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: sound skipping regression introduced in 2.6.30-rc8

At Thu, 11 Jun 2009 23:38:17 +0200,
Sven Köhler wrote:
> 
> >>>> Can somebody point out, how I can set this xrun_debug thing or can
> >>>> somebody provide a patch that reverts the change?
> >>> Did you read my reply to David?
> >> I will try, what is described there and I will report back if I get any
> >> debug output.
> > 
> > Thanks, that'll be be helpful.
> 
> Below is the output. Note, that audacious 2.x was not only skipping a
> little bit. In fact, the clock that was showing the time of audio played
> was running twice as fast or even 4 times as fast. The sound was played
> at the right samplerate but in fast it seems, that much of the audio
> data was skipped and I only heard a series of short fragments of what
> should have been the song I'm listening to.
> 
> 
> PCM: hw_ptr skipping! (pos=4096, delta=7169, period=1024, jdelta=0/149)

OK, it must be the same problem indeed as David and Bartlomiej see.

Although Bartlomiej wrote that reverting the commit below didn't help,
I still suspect it comes from there.
     commit da2436a23c038055b1da6fe30b6ea2886b1e07b0
     Author: Jaroslav Kysela <perex@...ex.cz>
     Date:   Mon Apr 13 21:31:25 2009 +0200
     [ALSA] intel8x0: do not use zero value from PICB register

The below is a revised patch to fix the possible regression from this.
Could you guys give it a try, or check reverting the above?


thanks,

Takashi

---
diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index 173bebf..2446ed6 100644
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -1077,15 +1077,18 @@ static snd_pcm_uframes_t snd_intel8x0_pcm_pointer(struct snd_pcm_substream *subs
 		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 < position ||
+		    ptr > position + substream->runtime->period_size)
+			ptr = position;
 	}
+	ichdev->last_pos = ptr;
+	ichdev->last_pos_jiffies = jiffies;
 	spin_unlock(&chip->reg_lock);
 	if (ptr >= ichdev->size)
 		return 0;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ