ACPI / scan: Refactor _CCA enforcement

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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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Robin Murphy 2018-12-06 13:20:49 -08:00 • committed by Christoph Hellwig

parent 90ac706e98

commit e5361ca29f

3 changed files with 7 additions and 4 deletions

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5

drivers/acpi/scan.c

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3

drivers/base/platform.c

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3

drivers/pci/pci-driver.c

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