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Date: Tue, 8 Aug 2017 20:03:10 +0200
From: Johan Hovold <johan@...nel.org>
To: Christoph Hellwig <hch@....de>
Cc: Johan Hovold <johan@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andreas Färber <afaerber@...e.de>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
Alan Stern <stern@...land.harvard.edu>,
stable <stable@...r.kernel.org>,
Robin Murphy <robin.murphy@....com>,
Sricharan R <sricharan@...eaurora.org>,
Stefan Wahren <stefan.wahren@...e.com>
Subject: Re: [PATCH v3] dma-mapping: skip USB devices when configuring DMA
during probe
On Sat, Aug 05, 2017 at 10:38:07AM +0200, Christoph Hellwig wrote:
> I think the root problem is that the code added by
> " of/acpi: Configure dma operations at probe time for platform/amba/pci bus
> devices"
>
> is completely bogus and needs to be reverted. We can't simply iterate
> over all devices in the system and set up dma for them. We'll need
> to ask the firmware / OF what root port this applies to and only
> apply it to those buses.
I'm afraid I haven't had time to look any more at this, and now I'll be
offline for the next two weeks.
It sounded like Robin was working on a fix for the broken DMA-mask on
RPI3 and that should address Hans's ethernet regression too even if we
ultimately need to fix dma_configure() as well.
Thanks,
Johan
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