iommu: Move more initialization to __iommu_probe_device()

Move the calls to dev_iommu_get() and try_module_get() into
__iommu_probe_device(), so that the callers don't have to do it on
their own.

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/20200429133712.31431-34-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/iommu.c

@@ -194,9 +194,19 @@ static int __iommu_probe_device(struct device *dev, struct list_head *group_list
 	struct iommu_group *group;
 	int ret;
 
+	if (!dev_iommu_get(dev))
+		return -ENOMEM;
+
+	if (!try_module_get(ops->owner)) {
+		ret = -EINVAL;
+		goto err_free;
+	}
+
 	iommu_dev = ops->probe_device(dev);
-	if (IS_ERR(iommu_dev))
-		return PTR_ERR(iommu_dev);
+	if (IS_ERR(iommu_dev)) {
+		ret = PTR_ERR(iommu_dev);
+		goto out_module_put;
+	}
 
 	dev->iommu->iommu_dev = iommu_dev;
 
@@ -217,6 +227,12 @@ static int __iommu_probe_device(struct device *dev, struct list_head *group_list
 out_release:
 	ops->release_device(dev);
 
+out_module_put:
+	module_put(ops->owner);
+
+err_free:
+	dev_iommu_free(dev);
+
 	return ret;
 }
 
@@ -226,14 +242,6 @@ int iommu_probe_device(struct device *dev)
 	struct iommu_group *group;
 	int ret;
 
-	if (!dev_iommu_get(dev))
-		return -ENOMEM;
-
-	if (!try_module_get(ops->owner)) {
-		ret = -EINVAL;
-		goto err_out;
-	}
-
 	ret = __iommu_probe_device(dev, NULL);
 	if (ret)
 		goto err_out;
@@ -1532,14 +1540,10 @@ struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
 
 static int probe_iommu_group(struct device *dev, void *data)
 {
-	const struct iommu_ops *ops = dev->bus->iommu_ops;
 	struct list_head *group_list = data;
 	struct iommu_group *group;
 	int ret;
 
-	if (!dev_iommu_get(dev))
-		return -ENOMEM;
-
 	/* Device is probed already if in a group */
 	group = iommu_group_get(dev);
 	if (group) {
@@ -1547,22 +1551,7 @@ static int probe_iommu_group(struct device *dev, void *data)
 		return 0;
 	}
 
-	if (!try_module_get(ops->owner)) {
-		ret = -EINVAL;
-		goto err_free_dev_iommu;
-	}
-
 	ret = __iommu_probe_device(dev, group_list);
-	if (ret)
-		goto err_module_put;
-
-	return 0;
-
-err_module_put:
-	module_put(ops->owner);
-err_free_dev_iommu:
-	dev_iommu_free(dev);
-
 	if (ret == -ENODEV)
 		ret = 0;