Re: Tearing down DMA transfer setup after DMA client has finished
From: Vinod Koul
Date: Thu Dec 08 2016 - 05:30:59 EST
On Wed, Dec 07, 2016 at 04:45:58PM +0000, Måns Rullgård wrote:
> Vinod Koul <vinod.koul@xxxxxxxxx> writes:
> > On Tue, Dec 06, 2016 at 01:14:20PM +0000, Måns Rullgård wrote:
> >> That's not going to work very well. Device drivers typically request
> >> dma channels in their probe functions or when the device is opened.
> >> This means that reserving one of the few channels there will inevitably
> >> make some other device fail to operate.
> > No that doesnt make sense at all, you should get a channel only when you
> > want to use it and not in probe!
> Tell that to just about every single driver ever written.
Not really, few do yes which is wrong but not _all_ do that.