[PATCH 15/15] vfio/mdev: remove an extra parent kobject reference

Christoph Hellwig
2022-07-06T07:43:37Z

The mdev_type already holds a reference to the parent through
mdev_types_kset, so drop the extra reference.

Suggested-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/vfio/mdev/mdev_sysfs.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index c5cd035d591d0..e2087cac1c859 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -153,8 +153,6 @@ static void mdev_type_release(struct kobject *kobj)
struct mdev_type *type = to_mdev_type(kobj);

pr_debug("Releasing group %s\n", kobj->name);
- /* Pairs with the get in add_mdev_supported_type() */
- put_device(type->parent->dev);
kfree(type);
}

@@ -170,16 +168,12 @@ static int mdev_type_add(struct mdev_parent *parent, struct mdev_type *type)

type->kobj.kset = parent->mdev_types_kset;
type->parent = parent;
- /* Pairs with the put in mdev_type_release() */
- get_device(parent->dev);

ret = kobject_init_and_add(&type->kobj, &mdev_type_ktype, NULL,
"%s-%s", dev_driver_string(parent->dev),
type->sysfs_name);
- if (ret) {
- kobject_put(&type->kobj);
+ if (ret)
return ret;
- }

type->devices_kobj = kobject_create_and_add("devices", &type->kobj);
if (!type->devices_kobj) {
@@ -191,7 +185,6 @@ static int mdev_type_add(struct mdev_parent *parent, struct mdev_type *type)

attr_devices_failed:
kobject_del(&type->kobj);
- kobject_put(&type->kobj);
return ret;
}

--
2.30.2