linux-kernel - Re: ehci-pci breakage with dma-mapping changes in 5.4-rc2

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Message-ID: <20191007175630.GA28861@infradead.org>
Date:   Mon, 7 Oct 2019 10:56:30 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>, linux-kernel@...r.kernel.org
Subject: Re: ehci-pci breakage with dma-mapping changes in 5.4-rc2

On Mon, Oct 07, 2019 at 07:55:28PM +0200, Christoph Hellwig wrote:
> On Mon, Oct 07, 2019 at 01:54:32PM -0400, Arvind Sankar wrote:
> > It doesn't boot with the patch. Won't it go
> > 	dma_get_required_mask
> > 	-> intel_get_required_mask
> > 	-> iommu_need_mapping
> > 	-> dma_get_required_mask
> > ?
> > 
> > Should the call to dma_get_required_mask in iommu_need_mapping be
> > replaced with dma_direct_get_required_mask on top of your patch?
> 
> Yes, sorry.

Actually my patch already calls dma_direct_get_required_mask.
How did you get the loop?