linux-kernel - Re: 2.6.24-rc8-mm1: old sparc64 bug

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Message-Id: <200801282313.52670.m.kozlowski@tuxland.pl>
Date:	Mon, 28 Jan 2008 23:13:52 +0100
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
	David Miller <davem@...emloft.net>, perex@...ex.cz
Subject: Re: 2.6.24-rc8-mm1: old sparc64 bug

Hello Takashi,

> > > > 	I was digging through the gentoo bugzilla and found this:
> > > > 
> > > > http://bugs.gentoo.org/show_bug.cgi?id=141823
> > > > 
> > > > As you see this bug is present since at least 2.6.17. I can reproduce
> > > > that here on my hardware with 2.6.24-rc8-mm1. All you need to do is install
> > > > mp3blaster on sparc64, run:
> > > > 
> > > > $ mp3blaster some_mp3_file.mp3 
> > > > 
> > > > and stop it by pressing ctrl-c. It oopses when you stop it. It doesn't happen
> > > > every time but it'll oops in a few tries.
> > > 
> > > This looks similar like a bug I fixed ago.  Damn, it's still there.
> > > 
> > > Could you build with CONFIG_SND_DEBUG=y ?  It addas some sanity checks
> > > and might catch the fatal condition.
> > 
> > Done. I don't think it changed much though :-/
> 
> OK, could you try the patch below?

Great news. It works fine now. I tested it for some time but I'll test it even more
tommorow.

Thanks,

	Mariusz

> 
> thanks,
> 
> Takashi
> 
> ---
> 
> diff -r edbe1b84179b sound/core/oss/pcm_oss.c
> --- a/sound/core/oss/pcm_oss.c	Mon Jan 28 12:30:17 2008 +0100
> +++ b/sound/core/oss/pcm_oss.c	Mon Jan 28 12:56:13 2008 +0100
> @@ -1621,6 +1621,7 @@ static int snd_pcm_oss_sync(struct snd_p
>  					snd_pcm_format_set_silence(runtime->format,
>  								   runtime->oss.buffer,
>  								   size1);
> +					size1 /= runtime->channels; /* frames */
>  					fs = snd_enter_user();
>  					snd_pcm_lib_write(substream, (void __user *)runtime->oss.buffer, size1);
>  					snd_leave_user(fs);
> 


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