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SubjectRe: [PATCH 1/2] xen/arm, arm64: fix xen_dma_ops after 815dd18 "Consolidate get_dma_ops..."
On Thu, Apr 13, 2017 at 02:04:21PM -0700, Stefano Stabellini wrote:
> The following commit:
>
> commit 815dd18788fe0d41899f51b91d0560279cf16b0d
> Author: Bart Van Assche <bart.vanassche@sandisk.com>
> Date: Fri Jan 20 13:04:04 2017 -0800
>
> treewide: Consolidate get_dma_ops() implementations
>
> rearranges get_dma_ops in a way that xen_dma_ops are not returned when
> running on Xen anymore, dev->dma_ops is returned instead (see
> arch/arm/include/asm/dma-mapping.h:get_arch_dma_ops and
> include/linux/dma-mapping.h:get_dma_ops).
>
> Fix the problem by storing dev->dma_ops in dev_archdata, and setting
> dev->dma_ops to xen_dma_ops. This way, xen_dma_ops is returned naturally
> by get_dma_ops. The Xen code can retrieve the original dev->dma_ops from
> dev_archdata when needed. It also allows us to remove __generic_dma_ops
> from common headers.
>
> Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
> Tested-by: Julien Grall <julien.grall@arm.com>
> Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
> CC: linux@armlinux.org.uk
> CC: catalin.marinas@arm.com
> CC: will.deacon@arm.com
> CC: boris.ostrovsky@oracle.com
> CC: jgross@suse.com
> CC: Julien Grall <julien.grall@arm.com>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

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