Re: [PATCH] RDMA/core: skip compat cleanup for init_net

[Leon Romanovsky <leon@kernel.org>]

On Wed, Oct 28, 2026 at 01:02:44PM +0800, Jiale Yao wrote:
> rdma_dev_init_net() does not allocate an rdma_nets XArray entry or
> create compatibility devices for init_net.  rdma_dev_exit_net() still
> runs the common cleanup, using the zero-initialized rnet->id to hide and
> erase an entry and removing compatibility devices with that ID.  ID zero
> may belong to a non-default network namespace.

No, it can't

Thanks

> 
> Handle init_net separately on exit, mirroring the initialization path.
> Only tear down its netlink state and leave the XArray and compatibility
> devices untouched.
> 
> Fixes: 1d2fedd8561d ("RDMA/core: Support netlink commands in non init_net net namespaces")
> Cc: stable@vger.kernel.org
> Signed-off-by: Jiale Yao <yaojiale02@163.com>
> ---
>  drivers/infiniband/core/device.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> index 29af9fe860e2..74460850ccba 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -1153,6 +1153,11 @@ static void rdma_dev_exit_net(struct net *net)
>  	unsigned long index;
>  	int ret;
>  
> +	if (net_eq(net, &init_net)) {
> +		rdma_nl_net_exit(rnet);
> +		return;
> +	}
> +
>  	down_write(&rdma_nets_rwsem);
>  	/*
>  	 * Prevent the ID from being re-used and hide the id from xa_for_each.
> -- 
> 2.34.1
>