[v4,2/6] iommu: Split iommu_group_remove_device() into helpers
Commit Message
So that code could be re-used by iommu_release_device() in the subsequent
change. No intention for functionality change.
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/iommu/iommu.c | 64 +++++++++++++++++++++++++++++--------------
1 file changed, 44 insertions(+), 20 deletions(-)
@@ -453,6 +453,46 @@ int iommu_probe_device(struct device *dev)
}
+/*
+ * Remove a device from a group's device list and return the group device
+ * if successful.
+ */
+static struct group_device *
+__iommu_group_remove_device(struct iommu_group *group, struct device *dev)
+{
+ struct group_device *device;
+
+ lockdep_assert_held(&group->mutex);
+ list_for_each_entry(device, &group->devices, list) {
+ if (device->dev == dev) {
+ list_del(&device->list);
+ return device;
+ }
+ }
+
+ return NULL;
+}
+
+/*
+ * Release a device from its group and decrements the iommu group reference
+ * count.
+ */
+static void __iommu_group_release_device(struct iommu_group *group,
+ struct group_device *grp_dev)
+{
+ struct device *dev = grp_dev->dev;
+
+ sysfs_remove_link(group->devices_kobj, grp_dev->name);
+ sysfs_remove_link(&dev->kobj, "iommu_group");
+
+ trace_remove_device_from_group(group->id, dev);
+
+ kfree(grp_dev->name);
+ kfree(grp_dev);
+ dev->iommu_group = NULL;
+ kobject_put(group->devices_kobj);
+}
+
void iommu_release_device(struct device *dev)
{
const struct iommu_ops *ops;
@@ -1068,7 +1108,7 @@ EXPORT_SYMBOL_GPL(iommu_group_add_device);
void iommu_group_remove_device(struct device *dev)
{
struct iommu_group *group = dev->iommu_group;
- struct group_device *tmp_device, *device = NULL;
+ struct group_device *device;
if (!group)
return;
@@ -1076,27 +1116,11 @@ void iommu_group_remove_device(struct device *dev)
dev_info(dev, "Removing from iommu group %d\n", group->id);
mutex_lock(&group->mutex);
- list_for_each_entry(tmp_device, &group->devices, list) {
- if (tmp_device->dev == dev) {
- device = tmp_device;
- list_del(&device->list);
- break;
- }
- }
+ device = __iommu_group_remove_device(group, dev);
mutex_unlock(&group->mutex);
- if (!device)
- return;
-
- sysfs_remove_link(group->devices_kobj, device->name);
- sysfs_remove_link(&dev->kobj, "iommu_group");
-
- trace_remove_device_from_group(group->id, dev);
-
- kfree(device->name);
- kfree(device);
- dev->iommu_group = NULL;
- kobject_put(group->devices_kobj);
+ if (device)
+ __iommu_group_release_device(group, device);
}
EXPORT_SYMBOL_GPL(iommu_group_remove_device);