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    Subject[PATCH AUTOSEL 4.20 077/105] drm/sun4i: backend: add missing of_node_puts
    Date
    From: Julia Lawall <Julia.Lawall@lip6.fr>

    [ Upstream commit 4bb0e6d7258213d4893c2c876712fbba40e712fe ]

    The device node iterators perform an of_node_get on each
    iteration, so a jump out of the loop requires an of_node_put.

    Remote and port also have augmented reference counts, so drop them
    on each iteration and at the end of the function, respectively.
    Remote is only used for the address it contains, not for the
    contents of that address, so the reference count can be dropped
    immediately.

    The semantic patch that fixes the first part of this problem is
    as follows (http://coccinelle.lip6.fr):

    // <smpl>
    @@
    expression root,e;
    local idexpression child;
    iterator name for_each_child_of_node;
    @@

    for_each_available_child_of_node(root, child) {
    ... when != of_node_put(child)
    when != e = child
    + of_node_put(child);
    ? break;
    ...
    }
    ... when != child
    // </smpl>

    Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
    Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/1547369264-24831-5-git-send-email-Julia.Lawall@lip6.fr
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/sun4i/sun4i_backend.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
    index bf49c55b0f2c..9f27d5464804 100644
    --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
    +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
    @@ -704,17 +704,18 @@ static struct sun4i_frontend *sun4i_backend_find_frontend(struct sun4i_drv *drv,
    remote = of_graph_get_remote_port_parent(ep);
    if (!remote)
    continue;
    + of_node_put(remote);

    /* does this node match any registered engines? */
    list_for_each_entry(frontend, &drv->frontend_list, list) {
    if (remote == frontend->node) {
    - of_node_put(remote);
    of_node_put(port);
    + of_node_put(ep);
    return frontend;
    }
    }
    }
    -
    + of_node_put(port);
    return ERR_PTR(-EINVAL);
    }

    --
    2.19.1
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