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-rw-r--r--include/linux/iommu.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index e06a0fbe4bc7..e8b59ef54e48 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -603,7 +603,8 @@ __iommu_copy_struct_to_user(const struct iommu_user_data *dst_data,
* @capable: check capability
* @hw_info: report iommu hardware information. The data buffer returned by this
* op is allocated in the iommu driver and freed by the caller after
- * use.
+ * use. @type can input a requested type and output a supported type.
+ * Driver should reject an unsupported data @type input
* @domain_alloc: Do not use in new drivers
* @domain_alloc_identity: allocate an IDENTITY domain. Drivers should prefer to
* use identity_domain instead. This should only be used