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FROMLIST: drivers/iommu: Allow IOMMU bus ops to be unregistered

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'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>
Bug: 140290589
Link: https://lore.kernel.org/lkml/20191121114918.2293-7-will@kernel.org/
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Ia89fa2df61d2a9ad04901d4c2e71e293c4c6171d
This commit is contained in:
Will Deacon 2019-11-11 12:16:40 +00:00 committed by Todd Kjos
parent 012da77b60
commit 138322ee74
1 changed files with 5 additions and 0 deletions
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5
drivers/iommu/iommu.c
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@ -1558,6 +1558,11 @@ int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
{
int err;
if (ops == NULL) {
bus->iommu_ops = NULL;
return 0;
}
if (bus->iommu_ops != NULL)
return -EBUSY;