On Thu, 29 Aug 2019 06:19:00 -0500
Parav Pandit <pa...@mellanox.com> wrote:
> 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 <pa...@mellanox.com>
>
> ---
> Changelog:
> v1->v2:
> - Moved alias NULL check at beginning
> v0->v1:
> - Fixed inclusiong of alias for NULL check
> - Added ratelimited debug print for sha1 hash collision error
> ---
> drivers/vfio/mdev/mdev_core.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
> index 3bdff0469607..c9bf2ac362b9 100644
> --- a/drivers/vfio/mdev/mdev_core.c
> +++ b/drivers/vfio/mdev/mdev_core.c
> @@ -388,6 +388,13 @@ int mdev_device_create(struct kobject *kobj, struct
> device *dev,
> ret = -EEXIST;
> goto mdev_fail;
> }
> + if (alias && tmp->alias && strcmp(alias, tmp->alias) == 0) {
> + mutex_unlock(&mdev_list_lock);
> + ret = -EEXIST;
> + dev_dbg_ratelimited(dev, "Hash collision in alias
> creation for UUID %pUl\n",
> + uuid);
> + goto mdev_fail;
> + }
> }
>
> mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
Any reason not to merge this into the first patch?
