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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> Bug: 140290589 Link: https://lore.kernel.org/lkml/20191121114918.2293-5-will@kernel.org/ Signed-off-by: Will Deacon <willdeacon@google.com> Change-Id: I8f6a8aad8c41faa51df9c3a440c8b80c74e3ce8a |
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