There can be only one, we could allocate it dynamically, but then we d have to add an extra parameter to some functions, and use something as ugly as struct ipu ipu = to_ipu(to_idmac(ichan->dma_chan.device)) in the ISR.

-There can be only one, we could allocate it dynamically, but then we d have to add an extra parameter to some functions, and use something as ugly as struct ipu ipu = to_ipu(to_idmac(ichan->dma_chan.device))　in the ISR.