iommu: Unexport iommu_group_get_for_dev()

The function is now only used in IOMMU core code and shouldn't be used
outside of it anyway, so remove the export for it.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20200429133712.31431-35-joro@8bytes.orgSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/iommu.c

@@ -91,6 +91,7 @@ static void __iommu_detach_group(struct iommu_domain *domain,
 				 struct iommu_group *group);
 static int iommu_create_device_direct_mappings(struct iommu_group *group,
 					       struct device *dev);
+static struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 
 #define IOMMU_GROUP_ATTR(_name, _mode, _show, _store)		\
 struct iommu_group_attribute iommu_group_attr_##_name =		\
@@ -1500,7 +1501,7 @@ static int iommu_alloc_default_domain(struct device *dev)
  * to the returned IOMMU group, which will already include the provided
  * device.  The reference should be released with iommu_group_put().
  */
-struct iommu_group *iommu_group_get_for_dev(struct device *dev)
+static struct iommu_group *iommu_group_get_for_dev(struct device *dev)
 {
 	const struct iommu_ops *ops = dev->bus->iommu_ops;
 	struct iommu_group *group;
@@ -1531,7 +1532,6 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
 
 	return ERR_PTR(ret);
 }
-EXPORT_SYMBOL(iommu_group_get_for_dev);
 
 struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
 {

include/linux/iommu.h

@@ -527,7 +527,6 @@ extern int iommu_page_response(struct device *dev,
 			       struct iommu_page_response *msg);
 
 extern int iommu_group_id(struct iommu_group *group);
-extern struct iommu_group *iommu_group_get_for_dev(struct device *dev);
 extern struct iommu_domain *iommu_group_default_domain(struct iommu_group *);
 
 extern int iommu_domain_get_attr(struct iommu_domain *domain, enum iommu_attr,