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iommu: Do not probe devices on IOMMU-less busses

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The host1x bus implemented on Tegra SoCs is primarily an abstraction to
create logical device from multiple platform devices. Since the devices
in such a setup are typically hierarchical, DMA setup still needs to be
done so that DMA masks can be properly inherited, but we don't actually
want to attach the host1x logical devices to any IOMMU. The platform
devices that make up the logical device are responsible for memory bus
transactions, so it is them that will need to be attached to the IOMMU.

Add a check to __iommu_probe_device() that aborts IOMMU setup early for
busses that don't have the IOMMU operations pointer set since they will
cause a crash otherwise.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20200511161000.3853342-1-thierry.reding@gmail.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Thierry Reding 2020-05-11 18:10:00 +02:00 committed by Joerg Roedel
parent cfcccbe887
commit f38338cf06
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/iommu.c
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@ -195,6 +195,9 @@ static int __iommu_probe_device(struct device *dev, struct list_head *group_list
struct iommu_group *group;
int ret;
if (!ops)
return -ENODEV;
if (!dev_iommu_get(dev))
return -ENOMEM;