linux-kernel - Re: [PATCH v2 2/3] of: overlay: unittest: add tests for overlay notifiers

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Date:   Mon, 2 May 2022 19:58:11 -0500
From:   Rob Herring <robh@...nel.org>
To:     frowand.list@...il.com
Cc:     pantelis.antoniou@...sulko.com,
        Slawomir Stepien <slawomir.stepien@...ia.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Slawomir Stepien <sst@...zta.fm>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH v2 2/3] of: overlay: unittest: add tests for overlay
 notifiers

On Mon, May 02, 2022 at 01:17:41PM -0500, frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> Add tests for overlay apply and remove notifiers.  Trigger errors
> for each of the notifier actions.
> 
> These tests will reveal a memory leak problem when a notifier returns
> an error for action OF_OVERLAY_POST_APPLY.  The pr_err() message is:
> 
>    OF: ERROR: memory leak, expected refcount 1 instead of 3,
>    of_node_get()/of_node_put() unbalanced - destroy cset entry: attach
>    overlay node /testcase-data/overlay-node/test-bus/test-unittest17
> 
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---
> Changes since version 1:
>   - patch 1/1 v1 did not apply on Rob's dt/next branch, rebase on top of
>     5f756a2eaa44 of: overlay: do not break notify on NOTIFY_{OK|STOP}
> 
> Output of the new overlay notifier unittests, as filtered by
> scripts/dtc/of_unittest_expect:
> 
>    ### dt-test ### pass of_unittest_overlay_notify():2825
> ok OF: overlay: overlay changeset pre-apply notifier error -16, target: /testcase-data/overlay-node/test-bus
>    ### dt-test ### pass of_unittest_overlay_notify():2846
>    ### dt-test ### pass of_unittest_overlay_notify():2851
> ok OF: overlay: overlay changeset post-apply notifier error -17, target: /testcase-data/overlay-node/test-bus
>    OF: ERROR: memory leak, expected refcount 1 instead of 3, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /testcase-data/overlay-node/test-bus/test-unittest17
>    ### dt-test ### pass of_unittest_overlay_notify():2857
>    ### dt-test ### pass of_unittest_overlay_notify():2862
>    ### dt-test ### pass of_unittest_overlay_notify():2866
>    ### dt-test ### pass of_unittest_overlay_notify():2869
> ok OF: overlay: overlay changeset pre-remove notifier error -18, target: /testcase-data/overlay-node/test-bus
>    ### dt-test ### pass of_unittest_overlay_notify():2880
>    ### dt-test ### pass of_unittest_overlay_notify():2888
>    ### dt-test ### pass of_unittest_overlay_notify():2892
>    ### dt-test ### pass of_unittest_overlay_notify():2895
> ok OF: overlay: overlay changeset post-remove notifier error -19, target: /testcase-data/overlay-node/test-bus
>    ### dt-test ### pass of_unittest_overlay_notify():2902
>    ### dt-test ### pass of_unittest_overlay_notify():2909
>    ### dt-test ### pass of_unittest_overlay_notify():2914
>    ### dt-test ### pass of_unittest_overlay_notify():2926
> 
> Note that four new kernel error messages are triggered by the new
> tests, and of_unittest_expect labels them as expected errors with
> the string 'ok ' in the first three columns.
> 
> A fifth new kernel error message is a real bug, which will be fixed
> in patch 3/3:
> 
>    OF: ERROR: memory leak, expected refcount 1 instead of 3, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /testcase-data/overlay-node/test-bus/test-unittest17
> 
> 
>  drivers/of/unittest-data/Makefile       |  10 ++
>  drivers/of/unittest-data/overlay_16.dts |  15 ++
>  drivers/of/unittest-data/overlay_17.dts |  15 ++
>  drivers/of/unittest-data/overlay_18.dts |  15 ++
>  drivers/of/unittest-data/overlay_19.dts |  15 ++
>  drivers/of/unittest-data/overlay_20.dts |  15 ++
>  drivers/of/unittest.c                   | 198 ++++++++++++++++++++++++
>  7 files changed, 283 insertions(+)
>  create mode 100644 drivers/of/unittest-data/overlay_16.dts
>  create mode 100644 drivers/of/unittest-data/overlay_17.dts
>  create mode 100644 drivers/of/unittest-data/overlay_18.dts
>  create mode 100644 drivers/of/unittest-data/overlay_19.dts
>  create mode 100644 drivers/of/unittest-data/overlay_20.dts

Applied, thanks!