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Subject[PATCH 3/3] iommu: Warn once when device_group callback returns NULL
Date
From: Joerg Roedel <jroedel@suse.de>

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>
---
drivers/iommu/iommu.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index de09e1e..3f6ea16 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -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;

--
2.7.4
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