iommu: Make iommu_release_device() static

This is not called outside the core code, and indeed cannot be called
correctly outside the bus notifier. Make it static.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/0-v1-c3da18124d2d+56-rm_iommu_release_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/iommu.c

@@ -87,6 +87,7 @@ static const char * const iommu_group_resv_type_string[] = {
 
 static int iommu_bus_notifier(struct notifier_block *nb,
 			      unsigned long action, void *data);
+static void iommu_release_device(struct device *dev);
 static int iommu_alloc_default_domain(struct iommu_group *group,
 				      struct device *dev);
 static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
@@ -493,7 +494,7 @@ static void __iommu_group_release_device(struct iommu_group *group,
 	kobject_put(group->devices_kobj);
 }
 
-void iommu_release_device(struct device *dev)
+static void iommu_release_device(struct device *dev)
 {
 	struct iommu_group *group = dev->iommu_group;
 	struct group_device *device;

include/linux/iommu.h

@@ -699,7 +699,6 @@ static inline void dev_iommu_priv_set(struct device *dev, void *priv)
 }
 
 int iommu_probe_device(struct device *dev);
-void iommu_release_device(struct device *dev);
 
 int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
 int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);