Dmaengine problem

[rd bairva]

Hi,
       I am currently writing dmaengine compatible DMA driver for our ARM
based architecture, But I am facing some performance issues doing
that.

1. dmaengine says callback should run in tasklet, and next transfer
cannot be scheduled from the callback.

Due to these restrictions I am getting some performance issue while
playing sound in our architecture.


Can callback call in DMA driver be placed out of spin_lock to submit
new operations from callback? (only in asynchronous case)

is this Ok? please comment.


Thanks and regards,
Ramdayal