Re: [alsa-devel] [PATCH] ASoC: s3c24xx platform: Fix s3c2410_dma_started called at wrong time

But why are you changing the core DMA code in the first place? The ASoC drivers have split front end and DMA code but this is not the normal case for a DMA client.

I think your idea of the callback is very elegant and I appreciate this way to solve the problem so I try to add new API for the core DMA to achive this goal.

Well, if there are two arguments for the callback function passed though struct struct s3c2410_dma_client, it's also reasonable. If there are more arguments to pass, maybe this is not the best solution. Use a internal struct to wrapper more arguments into one object and pass the pointer is just a candidate.