[alsa-devel] [PATCH 01/11] dma: imx-sdma: make channel0 operations atomic

[Huang Shijie]

On Fri, Apr 27, 2012 at 11:13 AM, Lothar Waßmann <LW at karo-electronics.de> wrote:
> Hi,
>
> Richard Zhao writes:
>> On Fri, Apr 27, 2012 at 11:18:31AM +0200, Lothar Waßmann wrote:
>> > Hi,
>> >
>> > Richard Zhao writes:
>> > > device_prep_dma_cyclic may be call in audio trigger function which is
>> > > atomic context, so we make it atomic too.
>> > >
>> > >  - change channel0 lock to spinlock.
>> > >  - Use polling to wait for channel0 finish running.
>> > >
>> > > Signed-off-by: Lothar Waßmann <LW at KARO-electronics.de>
>> > >
>> > Actually I didn't sign off the patch that I posted, because I wanted
>> > to wait for more comments first.
>> I send it out with slight modifications because the series highly
>> depend on it. Will you take it over or let me put it in next version?
>> Both are ok to me.
>>
> I think you should keep it as part of your sound patches and I will
> test your final version on our hardware.
>
I hope we can get a conclusion that the prep_slave_sg() can be called
in atomic context or not.
My patch "add DMA support to UART" heavily depends on it.

Huang Shijie

>
> Lothar Waßmann
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