linux-kernel - Re: [PATCH] dma-mapping: Relax warnings for per-device areas

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Date:   Wed, 18 Jul 2018 14:55:59 -0700
From:   Geoff Levand <geoff@...radead.org>
To:     Fredrik Noring <noring@...rew.org>, Christoph Hellwig <hch@....de>
Cc:     Robin Murphy <robin.murphy@....com>, m.szyprowski@...sung.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        JuergenUrban@....de
Subject: Re: [PATCH] dma-mapping: Relax warnings for per-device areas

Hi,

On 07/17/2018 09:33 AM, Fredrik Noring wrote:
>>> Here are three other regressions related to the coherent mask WARN_ON_ONCE:
>>
>> They are a pretty strong indication that yes, you should really set
>> the coherent mask if you ever do coherent allocations..
> 
> I'm unfortunately unfamiliar with the USB drivers for the PS3. Geoff, what
> do you think about setting a coherent mask?

I guess we need to add a dma_set_coherent_mask() call in the driver
probe routines.  I'll send out a patch.

-Geoff