Re: [PATCH v2 2/4] dmaengine: Add STM32 DMA driver

[Daniel Thompson]

On 14/10/15 16:26, M'boumba Cedric Madianga wrote:
> 2015-10-14 16:24 GMT+02:00 Daniel Thompson <daniel.thompson@xxxxxxxxxx>:
> > Hmnnn...
> >
> > The dmaengine framework will WARN_ONCE() if an dmaengine is removed whilst
> > it is active and also works hard to ensure dmaengine modules are not removed
> > whilst there are active drivers using the framework.
> >
> > How do we get into this function whilst there is still an active DMA
> > channels?
>
> For example, when a user try "rmmod stm32-dma" in uart console.
> It will enter in stm32_dma_remove while there is potentially still active DMA.

Check dmaengine.c for yourself but I think in this case the dmaengine 
framework will hold references to the module and prevent the remove from 
taking place.


Daniel.
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