Re: imx7: dev->coherent_dma_mask NULL warning

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Subject: Re: imx7: dev->coherent_dma_mask NULL warning
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 18 Aug 2021 15:28:00 +0200
Cc: Christoph Hellwig <hch@xxxxxx>, Kalle Valo <kvalo@xxxxxxxxxxxxxx>, ath10k@xxxxxxxxxxxxxxxxxxx, Ulf Hansson <ulf.hansson@xxxxxxxxxx>, Bough Chen <haibo.chen@xxxxxxx>, linux-mmc <linux-mmc@xxxxxxxxxxxxxxx>
In-reply-to: <CAOMZO5APotsBKPkN6tFDNnK0C7w7pzJ8zTWKUx6P=Rhd9_81mQ@mail.gmail.com>
User-agent: Mutt/1.5.17 (2007-11-01)

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.

Follow-Ups:
- Re: imx7: dev->coherent_dma_mask NULL warning
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References:
- imx7: dev->coherent_dma_mask NULL warning
  - From: Fabio Estevam
- Re: imx7: dev->coherent_dma_mask NULL warning
  - From: Christoph Hellwig
- Re: imx7: dev->coherent_dma_mask NULL warning
  - From: Fabio Estevam

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