drivers/iommu: Take a ref to the IOMMU driver prior to ->add_device()

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To avoid accidental removal of an active IOMMU driver module, take a
reference to the driver module in 'iommu_probe_device()' immediately
prior to invoking the '->add_device()' callback and hold it until the
after the device has been removed by '->remove_device()'.

Suggested-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

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Will Deacon 2019-12-19 12:03:41 +00:00 • committed by Joerg Roedel

parent 1a373a78b8

commit 25f003de98

2 changed files with 20 additions and 3 deletions

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19

drivers/iommu/iommu.c

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4

include/linux/iommu.h

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