[PATCH 2/4] mdev: Make mdev alias unique among all mdevs

Parav Pandit
2019-08-26T20:42:01Z

Mdev alias should be unique among all the mdevs, so that when such alias
is used by the mdev users to derive other objects, there is no
collision in a given system.

Signed-off-by: Parav Pandit <parav@mellanox.com>
---
drivers/vfio/mdev/mdev_core.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index e825ff38b037..6eb37f0c6369 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -375,6 +375,11 @@ int mdev_device_create(struct kobject *kobj, struct device *dev,
ret = -EEXIST;
goto mdev_fail;
}
+ if (tmp->alias && strcmp(tmp->alias, alias) == 0) {
+ mutex_unlock(&mdev_list_lock);
+ ret = -EEXIST;
+ goto mdev_fail;
+ }
}

mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
--
2.19.2