On Mon, Apr 23, 2012 at 06:40:06PM +0900, Boojin Kim wrote: > I met a problem on DMA cyclic mode (DMA_CYCLIC) for sound playback. > Kernel BUG occurs during DMA transfer with DMA cyclic mode. > This patch makes the cookies into zero. But, cookies should be kept > during cyclic mode because cyclic mode re-uses the cookies.
The protection is there to prevent cookies being accidentally re-used. If you're running a cyclic transfer, even then you shouldn't be completing the same cookie time and time again - I think Vinod also concurs with this. I think our preference is for cyclic transfers to entire remain uncompleted, or to get a new cookie each time they allegedly "complete". _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
