From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Subject: Re: [PATCH 5/9] dma-mapping: support highmem in the generic remap
	allocator
Date: Tue, 4 Dec 2018 15:23:04 +0100
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To: Marek Szyprowski <m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Cc: Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>, Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Guo Ren <ren_guo-Y+KPrCd2zL4AvxtiuMwx3w@public.gmane.org>, Laura Abbott <labbott-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>, Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
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On Tue, Dec 04, 2018 at 09:38:02AM +0100, Marek Szyprowski wrote:
> Hi All,
> 
> On 2018-11-30 20:05, Robin Murphy wrote:
> > On 05/11/2018 12:19, Christoph Hellwig wrote:
> >> By using __dma_direct_alloc_pages we can deal entirely with struct page
> >> instead of having to derive a kernel virtual address.
> >
> > Simple enough :)
> >
> > Reviewed-by: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
> 
> This patch has landed linux-next yesterday and I've noticed that it
> breaks operation of many drivers. The change looked simple, but a stupid
> bug managed to slip into the code. After a short investigation I've
> noticed that __dma_direct_alloc_pages() doesn't set dma_handle and zero
> allocated memory, while dma_direct_alloc_pages() did. The other
> difference is the lack of set_memory_decrypted() handling.
> 
> Following patch fixes the issue, but maybe it would be better to fix it
> in kernel/dma/direct.c:

Thanks for spotting this Marek.  Can you send the patch below with a
signoff and a changelog so that I can queue it up?