iommu: Export bus_iommu_probe() and make is safe for re-probing
Add a check to the bus_iommu_probe() call-path to make sure it ignores devices which have already been successfully probed. Then export the bus_iommu_probe() function so it can be used by IOMMU drivers. Signed-off-by: NJoerg Roedel <jroedel@suse.de> Tested-by: NMarek Szyprowski <m.szyprowski@samsung.com> Acked-by: NMarek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20200429133712.31431-14-joro@8bytes.orgSigned-off-by: NJoerg Roedel <jroedel@suse.de>
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