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

[Parav Pandit]

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@xxxxxxxxxxxx>
---
 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