At Mon, 16 Nov 2009 18:06:41 +0100,
Ralf Baechle wrote:
> On Tue, Nov 17, 2009 at 12:48:14AM +0800, Wu Zhangjin wrote:
> > Seems this is MIPS specific, but it's not that easy to move this patch
> > into the arch/mips part, So, any better solution?
> > Thanks & Regards,
> > Wu Zhangjin
> > ------------------------
> > The user application mmap audio dma regions must be dma-coherent. This
> > patch fix it.
> > Without this patch, artsd will fail on boot, and mplayer will exit with
> > "Segmentation fault". (this happens on YeeLoong netbook, fuloong2f
> > mini pc with snd_cs5535 audio card)
> > This is originally from the to-mips branch of
> > http://dev.lemote.com/code/linux_loongson, and contributed by Yanhua
> > from Lemote Inc.
> > Reported-by: qiaochong <firstname.lastname@example.org>
> > Signed-off-by: Wu Zhangjin <email@example.com>
> This issue is an old ghost still around, see:
> which is a superset of your proposed patch and which itself is refering to
> an even older posting from 2003:
> The #ifdef'ed solution doesn't cut it for sure. Let's see what better we
> can find ...
Indeed. My preference option is to deploy dma_mmap_coherent() to
possible architectures and use it commonly in the ALSA core code.
But, as a temporary workaround, I'm fine with ifdef until the API is