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Re: [PATCH 0/5] PCM mmap (temporary) fixes for non-coherent architect

To: Andreas Mohr <andi@lisas.de>
Subject: Re: [PATCH 0/5] PCM mmap (temporary) fixes for non-coherent architectures
From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 12 Jan 2010 08:02:36 +0100
Cc: alsa-devel@alsa-project.org, Ralf Baechle <ralf@linux-mips.org>, Wu Zhangjin <wuzhangjin@gmail.com>, Thomas Bogendoerfer <tsbogend@alpha.franken.de>, linux-mips@linux-mips.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Kumar Gala <galak@gate.crashing.org>, Becky Bruce <beckyb@kernel.crashing.org>
In-reply-to: <20100101193130.GA21510@rhlx01.hs-esslingen.de>
References: <1259248388-20095-1-git-send-email-tiwai@suse.de> <20100101193130.GA21510@rhlx01.hs-esslingen.de>
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At Fri, 1 Jan 2010 20:31:30 +0100,
Andreas Mohr wrote:
> 
> Hi,
> 
> I've tried this patch set (with the typo-corrected part 4) on my ASUS
> WL-500gP v2 MIPSEL via a backport to 2.6.31.9, but all I get is a
> small blip of the sound I wanted to play, and then the system is fubar
> (I believe just the same thing as what happened without having this patch
> applied).

As I mentioned in the previous followup, if your device is a
USB-audio, the patch doesn't help because it's for devices with
buffers using dma_alloc_coherent().  For USB-audio, it uses vmalloc
for an intermediate buffer.  Maybe this should be changed to dma_*()
stuff for such architectures.

Nevertheless, I don't know whether the crash is related with the
audio part...


Takashi

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