Re: [PATCH] dmaengine: of-dma: router_xlate to return -EPROBE_DEFER if controller is not yet available

Vinod Koul
2021-07-28T07:12:23Z

On 17-07-21, 22:00, Peter Ujfalusi wrote:
> If the router_xlate can not find the controller in the available DMA
> devices then it should return with -EPORBE_DEFER in a same way as the
> of_dma_request_slave_channel() does.
>
> The issue can be reproduced if the event router is registered before the
> DMA controller itself and a driver would request for a channel before the
> controller is registered.
> In of_dma_request_slave_channel():
> 1. of_dma_find_controller() would find the dma_router
> 2. ofdma->of_dma_xlate() would fail and returned NULL
> 3. -ENODEV is returned as error code
>
> with this patch we would return in this case the correct -EPROBE_DEFER and
> the client can try to request the channel later.

Applied, thanks

--
~Vinod