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iommu/amd: Fix group refcounting
If acpihid_device_group() finds an existing group for the relevant devid, it should be taking an additional reference on that group. Otherwise, the caller of iommu_group_get_for_dev() will inadvertently remove the reference taken by iommu_group_add_device(), and the group will be freed prematurely if any device is removed. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -373,6 +373,8 @@ static struct iommu_group *acpihid_device_group(struct device *dev)
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if (!entry->group)
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entry->group = generic_device_group(dev);
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else
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iommu_group_ref_get(entry->group);
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return entry->group;
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}
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