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authorLu Baolu <baolu.lu@linux.intel.com>2023-03-22 14:49:52 +0800
committerJoerg Roedel <jroedel@suse.de>2023-03-22 15:45:16 +0100
commit293f2564f3dd76b749fc31ae4226bd818f860e4f (patch)
tree83da1f8629637282c6f77d5b01cba39ed4af928c /drivers/iommu
parent24dfb197c3b7d274e5f78fce5e63392526a933e9 (diff)
downloadlinux-stable-293f2564f3dd76b749fc31ae4226bd818f860e4f.tar.gz
iommu: Split iommu_group_remove_device() into helpers
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> Link: https://lore.kernel.org/r/20230322064956.263419-3-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/iommu.c64
1 files changed, 44 insertions, 20 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index ace9d418a115..942bab8b9798 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -453,6 +453,46 @@ err_out:
}
+/*
+ * 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);