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From:   Takashi Iwai <tiwai@suse.de>
To:     Andreas Mohr <andi@lisas.de>
Cc:     alsa-devel@alsa-project.org, Ralf Baechle <ralf@linux-mips.org>,
        Wu Zhangjin <wuzhangjin@gmail.com>,
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        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Kumar Gala <galak@gate.crashing.org>,
        Becky Bruce <beckyb@kernel.crashing.org>
Subject: Re: [PATCH 0/5] PCM mmap (temporary) fixes for non-coherent    architectures
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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