imx7: dev->coherent_dma_mask NULL warning

[Fabio Estevam]

Hi Christoph,

On Wed, Aug 18, 2021 at 10:28 AM Christoph Hellwig <hch at lst.de> wrote:
>
> On Wed, Aug 18, 2021 at 06:31:19AM -0300, Fabio Estevam wrote:
> > Correct, on i.MX7 the ath10k Wifi chip connects via SDIO.
> >
> > Is there a way to avoid the WARN_ON_ONCE(!dev->coherent_dma_mask)
> > to happen in this case?
>
> The way to avoid it is by stoppind to use dma_alloc_attrs/coherent
> on a device that is not DMA capable.

Understood, thanks.

Maybe something like this (untested)?
https://pastebin.com/xTZqtRqD

Kalle,

>From an ath10k driver perspective: would you have any suggestions as
to how to stop calling
dma_alloc_coherent() for the SDIO and USB cases?

Thanks