linux-kernel - Re: snd_usb_audio OOPS on MIPSEL

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Date:	Thu, 26 Nov 2009 10:22:36 +0100
From:	Andreas Mohr <andi@...as.de>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	wuzhangjin@...il.com, Andreas Mohr <andi@...as.de>,
	ralf@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: snd_usb_audio OOPS on MIPSEL - is that the mmap issue?

Hi,

On Thu, Nov 26, 2009 at 10:09:04AM +0100, Takashi Iwai wrote:
> > This bug is really bad, Takashi Iwai and Ralf had a plan to add a
> > dma_mmap_coherent() function for 2.6.34 to fix it eventually.
> > 
> > but for 2.6.33, perhaps that patch is a good temp solution(not enough
> > for the whole bug, but minimally) ;)
> 
> I found a problem with that fix, namely, it doesn't distinguish the
> cases whether it's from dma_alloc_coherent() or directly from
> get_free_pages().  In the latter case, it'd do a wrong address
> conversion.
> 
> I'll try to fix up this issue so that my dma_mmap_coherent()
> conversion can be merged more smoothly in the ALSA core side, and
> report back.

Many thanks to both of you! I'll possibly try either the unmodified patch
or an updated version soon (unless I decide to yank that entire non-working
appliance to /dev/null for the near future, that is ;).

Andreas Mohr
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