linux-kernel - Re: [PATCH] RDMA/cma: Fix listener leak in rdma_cma_listen_on

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Date:   Wed, 15 Sep 2021 10:18:45 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Mark Zhang <markzhang@...dia.com>
Cc:     Tao Liu <thomas.liu@...oud.cn>, dledford@...hat.com,
        leon@...nel.org, haakon.bugge@...cle.com, shayd@...dia.com,
        avihaih@...dia.com, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, thomas.liu@...oud.com
Subject: Re: [PATCH] RDMA/cma: Fix listener leak in rdma_cma_listen_on_all()
 failure

On Wed, Sep 15, 2021 at 02:34:19PM +0800, Mark Zhang wrote:
> > -       case RDMA_CM_LISTEN:
> > -               if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
> > -                       cma_cancel_listens(id_priv);
> > -               break;
> 
> If this case is removed, is this code path still good?
> 
> cma_add_one/cma_remove_one
>   cma_process_remove
>     cma_send_device_removal_put
>       cma_cancel_operation

Yes, it is complicated, but the cma_process_remove() won't proceed
past cma_dev_put() until all the ULPs have gone through _destroy_id()

So all this does is move the reaping of the listens to the destroy_id
time

Jason