iommu/core: Remove global iommu_ops and register_iommu

With all IOMMU drivers being converted to bus_set_iommu the
global iommu_ops are no longer required. The same is true
for the deprecated register_iommu function.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 4 insertions, 23 deletions

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 1575aaa36c94..64419c88727e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -25,16 +25,6 @@
 #include <linux/errno.h>
 #include <linux/iommu.h>
 
-static struct iommu_ops *iommu_ops;
-
-void register_iommu(struct iommu_ops *ops)
-{
-        if (iommu_ops)
-                BUG();
-
-        iommu_ops = ops;
-}
-
 static void iommu_bus_init(struct bus_type *bus, struct iommu_ops *ops)
 {
 }
@@ -68,34 +58,25 @@ EXPORT_SYMBOL_GPL(bus_set_iommu);
 
 bool iommu_present(struct bus_type *bus)
 {
-        if (bus->iommu_ops != NULL)
-                return true;
-        else
-                return iommu_ops != NULL;
+        return bus->iommu_ops != NULL;
 }
 EXPORT_SYMBOL_GPL(iommu_present);
 
 struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
 {
         struct iommu_domain *domain;
-        struct iommu_ops *ops;
         int ret;
 
-        if (bus->iommu_ops)
-                ops = bus->iommu_ops;
-        else
-                ops = iommu_ops;
-
-        if (ops == NULL)
+        if (bus == NULL || bus->iommu_ops == NULL)
                 return NULL;
 
         domain = kmalloc(sizeof(*domain), GFP_KERNEL);
         if (!domain)
                 return NULL;
 
-        domain->ops = ops;
+        domain->ops = bus->iommu_ops;
 
-        ret = iommu_ops->domain_init(domain);
+        ret = domain->ops->domain_init(domain);
         if (ret)
                 goto out_free;