Re: [PATCH v2 1/3] EDAC/versalnet: Fix teardown ordering in mc_remove()

[Shubhrajyoti Datta]

On Wed, Apr 1, 2026 at 4:56 PM Prasanna Kumar T S M
<ptsm@xxxxxxxxxxxxxxxxxxx> wrote:
>
> The teardown sequence in mc_remove() does not mirror the reverse of the
> initialization order in mc_probe(). In particular,
> unregister_rpmsg_driver() is called before remove_versalnet(), and
> cdx_mcdi_finish() is called after rproc_shutdown().
>
> Reorder mc_remove() to reverse the probe initialization sequence,
> consistent with the probe error-unwind paths.

I think that the remote proc should be quiescence first so that no
more messages will be
queued. and then the edac should be removed. See below.

>
> The rproc reference acquired via rproc_get_by_phandle() during probe
> is not released in mc_remove(), causing a reference count leak. Add
> the missing rproc_put() call.
>
> Fixes: d5fe2fec6c40 ("EDAC: Add a driver for the AMD Versal NET DDR controller")
> Signed-off-by: Prasanna Kumar T S M <ptsm@xxxxxxxxxxxxxxxxxxx>
> ---
>  drivers/edac/versalnet_edac.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/edac/versalnet_edac.c b/drivers/edac/versalnet_edac.c
> index b87fe57aa842..acd51b492772 100644
> --- a/drivers/edac/versalnet_edac.c
> +++ b/drivers/edac/versalnet_edac.c
> @@ -955,10 +955,11 @@ static void mc_remove(struct platform_device *pdev)
>  {
>         struct mc_priv *priv = platform_get_drvdata(pdev);
>
> -       unregister_rpmsg_driver(&amd_rpmsg_driver);
>         remove_versalnet(priv);

Here we are removing the edac but the remoteproc  can be triggered.
calling the remote callback.

> -       rproc_shutdown(priv->mcdi->r5_rproc);
>         cdx_mcdi_finish(priv->mcdi);
> +       unregister_rpmsg_driver(&amd_rpmsg_driver);
> +       rproc_shutdown(priv->mcdi->r5_rproc);
> +       rproc_put(priv->mcdi->r5_rproc);
The put is a valid fix.

>         kfree(priv->mcdi);
>  }
>
> --
> 2.49.0
>
>