Re: [PATCH 2/9] dma: Convert from tasklet to BH workqueue

On Thu, Mar 28, 2024, at 20:39, Allen wrote:

quoted

quoted

Since almost every driver associates the tasklet with the
dma_chan, we could go one step further and add the
work_queue structure directly into struct dma_chan,
with the wrapper operating on the dma_chan rather than
the work_queue.

I think that is very great idea. having this wrapped in dma_chan would
be very good way as well

Am not sure if Allen is up for it :-)

 Thanks Arnd, I know we did speak about this at LPC. I did start
working on using completion. I dropped it as I thought it would
be easier to move to workqueues.

It's definitely easier to do the workqueue conversion as a first
step, and I agree adding support for the completion right away is
probably too much. Moving the work_struct into the dma_chan
is probably not too hard though, if you leave your current
approach for the cases where the tasklet is part of the
dma_dev rather than the dma_chan.

      Arnd