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Date:   Wed, 18 Aug 2021 15:28:00 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Fabio Estevam <festevam@gmail.com>
Cc:     Christoph Hellwig <hch@lst.de>, Kalle Valo <kvalo@codeaurora.org>,
        ath10k@lists.infradead.org, Ulf Hansson <ulf.hansson@linaro.org>,
        Bough Chen <haibo.chen@nxp.com>,
        linux-mmc <linux-mmc@vger.kernel.org>
Subject: Re: imx7: dev->coherent_dma_mask NULL warning
Message-ID: <20210818132800.GA6269@lst.de>
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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.