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iommu: Warn once when device_group callback returns NULL

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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>
This commit is contained in:
Joerg Roedel
2017-06-28 12:52:48 +02:00
parent 8faf5e5a12
commit 72dcac6334
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/iommu.c
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@ -1010,6 +1010,9 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
if (ops && ops->device_group) if (ops && ops->device_group)
group = ops->device_group(dev); group = ops->device_group(dev);
if (WARN_ON_ONCE(group == NULL))
return ERR_PTR(-EINVAL);
if (IS_ERR(group)) if (IS_ERR(group))
return group; return group;