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From:   Parav Pandit <parav@mellanox.com>
To:     alex.williamson@redhat.com, jiri@mellanox.com,
        kwankhede@nvidia.com, cohuck@redhat.com, davem@davemloft.net
Cc:     kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, Parav Pandit <parav@mellanox.com>
Subject: [PATCH 2/4] mdev: Make mdev alias unique among all mdevs
Date:   Mon, 26 Aug 2019 15:41:17 -0500
Message-Id: <20190826204119.54386-3-parav@mellanox.com>
In-Reply-To: <20190826204119.54386-1-parav@mellanox.com>
References: <20190826204119.54386-1-parav@mellanox.com>
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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