drivers/iommu: Allow IOMMU bus ops to be unregistered
'bus_set_iommu()' allows IOMMU drivers to register their ops for a given bus type. Unfortunately, it then doesn't allow them to be removed, which is necessary for modular drivers to shutdown cleanly so that they can be reloaded later on. Allow 'bus_set_iommu()' to take a NULL 'ops' argument, which clear the ops pointer for the selected bus_type. 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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@ -1558,6 +1558,11 @@ int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
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{
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int err;
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if (ops == NULL) {
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bus->iommu_ops = NULL;
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return 0;
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}
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if (bus->iommu_ops != NULL)
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return -EBUSY;
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