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authorRobin Murphy <robin.murphy@arm.com>2018-12-06 22:20:49 +0100
committerChristoph Hellwig <hch@lst.de>2018-12-13 21:06:13 +0100
commite5361ca29f2fea345c08d2b5cb5e3b1840cbafb8 (patch)
tree697be029cf1427e187d1547d376c719b185b632b /drivers/devfreq
parentdma-mapping: factor out dummy DMA ops (diff)
downloadlinux-e5361ca29f2fea345c08d2b5cb5e3b1840cbafb8.tar.xz
linux-e5361ca29f2fea345c08d2b5cb5e3b1840cbafb8.zip
ACPI / scan: Refactor _CCA enforcement
Rather than checking the DMA attribute at each callsite, just pass it through for acpi_dma_configure() to handle directly. That can then deal with the relatively exceptional DEV_DMA_NOT_SUPPORTED case by explicitly installing dummy DMA ops instead of just skipping setup entirely. This will then free up the dev->dma_ops == NULL case for some valuable fastpath optimisations. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Tested-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Tony Luck <tony.luck@intel.com>
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