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 qiaochong@gmail.com Signed-off-by: Wu Zhangjin wuzj@lemote.com
This issue is an old ghost still around, see:
http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20060124.13283...
which is a superset of your proposed patch and which itself is refering to an even older posting from 2003:
http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20030523215935...
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 defined...
thanks,
Takashi