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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
Date: Wed, 18 Aug 2021 15:28:00 +0200	[thread overview]
Message-ID: <20210818132800.GA6269@lst.de> (raw)
In-Reply-To: <CAOMZO5APotsBKPkN6tFDNnK0C7w7pzJ8zTWKUx6P=Rhd9_81mQ@mail.gmail.com>

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.

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WARNING: multiple messages have this Message-ID (diff)
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
Date: Wed, 18 Aug 2021 15:28:00 +0200	[thread overview]
Message-ID: <20210818132800.GA6269@lst.de> (raw)
In-Reply-To: <CAOMZO5APotsBKPkN6tFDNnK0C7w7pzJ8zTWKUx6P=Rhd9_81mQ@mail.gmail.com>

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.

  reply	other threads:[~2021-08-18 13:28 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18  0:23 imx7: dev->coherent_dma_mask NULL warning Fabio Estevam
2021-08-18  0:23 ` Fabio Estevam
2021-08-18  5:11 ` Christoph Hellwig
2021-08-18  5:11   ` Christoph Hellwig
2021-08-18  9:31   ` Fabio Estevam
2021-08-18  9:31     ` Fabio Estevam
2021-08-18 13:28     ` Christoph Hellwig [this message]
2021-08-18 13:28       ` Christoph Hellwig
2021-08-18 13:37       ` Fabio Estevam
2021-08-18 13:37         ` Fabio Estevam
2021-08-18 14:47         ` Fabio Estevam
2021-08-18 14:47           ` Fabio Estevam

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