iommu: Warn once when device_group callback returns NULL



This callback should never return NULL. Print a warning if
that happens so that we notice and can fix it.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

parent 8faf5e5a

drivers/iommu/iommu.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1010,6 +1010,9 @@ struct iommu_group iommu_group_get_for_dev(struct device dev)
		if (ops && ops->device_group)
		group = ops->device_group(dev);

		if (WARN_ON_ONCE(group == NULL))
		return ERR_PTR(-EINVAL);

		if (IS_ERR(group))
		return group;