linux-kernel - Re: [PATCH rdma-rc v2] RDMA/core: Simplify addition of restrack object

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Message-ID: <20210628113813.GA21676@nvidia.com>
Date:   Mon, 28 Jun 2021 08:38:13 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, Pavel Skripkin <paskripkin@...il.com>,
        Shay Drory <shayd@...dia.com>
Subject: Re: [PATCH rdma-rc v2] RDMA/core: Simplify addition of restrack
 object

On Mon, Jun 28, 2021 at 08:22:45AM +0300, Leon Romanovsky wrote:
> > The previous code didn't call restrack_del. restrack_del undoes the
> > restrack_set_name stuff, not just add - so it does not leave things
> > back the way it found them
> 
> The previous code didn't call to restrack_add and this is why it didn't
> call to restrack_del later. In old and new code, we are still calling to
> acquire and release dev (cma_acquire_dev_by_src_ip/cma_release_dev) and
> this is where the CM_ID is actually attached.

Which is my point, you can't call restrack_del anyplace except the
final destroy. It cannot be used for error unwinding in these kinds of
functions

Jason