From 3215e000eff69a613ef60ea00d9888987fe99c59 Mon Sep 17 00:00:00 2001 From: Biju Das Date: Wed, 5 Feb 2025 11:21:35 +0000 Subject: [PATCH] drm/tegra: rgb: Fix the unbound reference count [ Upstream commit 3c3642335065c3bde0742b0edc505b6ea8fdc2b3 ] The of_get_child_by_name() increments the refcount in tegra_dc_rgb_probe, but the driver does not decrement the refcount during unbind. Fix the unbound reference count using devm_add_action_or_reset() helper. Fixes: d8f4a9eda006 ("drm: Add NVIDIA Tegra20 support") Signed-off-by: Biju Das Signed-off-by: Thierry Reding Link: https://lore.kernel.org/r/20250205112137.36055-1-biju.das.jz@bp.renesas.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/tegra/rgb.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tegra/rgb.c b/drivers/gpu/drm/tegra/rgb.c index d6424abd3c45..8930460ba628 100644 --- a/drivers/gpu/drm/tegra/rgb.c +++ b/drivers/gpu/drm/tegra/rgb.c @@ -190,6 +190,11 @@ static const struct drm_encoder_helper_funcs tegra_rgb_encoder_helper_funcs = { .atomic_check = tegra_rgb_encoder_atomic_check, }; +static void tegra_dc_of_node_put(void *data) +{ + of_node_put(data); +} + int tegra_dc_rgb_probe(struct tegra_dc *dc) { struct device_node *np; @@ -197,7 +202,14 @@ int tegra_dc_rgb_probe(struct tegra_dc *dc) int err; np = of_get_child_by_name(dc->dev->of_node, "rgb"); - if (!np || !of_device_is_available(np)) + if (!np) + return -ENODEV; + + err = devm_add_action_or_reset(dc->dev, tegra_dc_of_node_put, np); + if (err < 0) + return err; + + if (!of_device_is_available(np)) return -ENODEV; rgb = devm_kzalloc(dc->dev, sizeof(*rgb), GFP_KERNEL);