linux-kernel - [PATCH] drm/meson: fix missing component unbind on bind errors

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Date:   Mon,  6 Mar 2023 11:35:33 +0100
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Neil Armstrong <neil.armstrong@...aro.org>
Cc:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan+linaro@...nel.org>, stable@...r.kernel.org
Subject: [PATCH] drm/meson: fix missing component unbind on bind errors

Make sure to unbind all subcomponents when binding the aggregate device
fails.

Fixes: a41e82e6c457 ("drm/meson: Add support for components")
Cc: stable@...r.kernel.org      # 4.12
Cc: Neil Armstrong <neil.armstrong@...aro.org>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
---

Note that this one has only been compile tested.

Johan


 drivers/gpu/drm/meson/meson_drv.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 79bfe3938d3c..7caf937c3c90 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -325,23 +325,23 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 
 	ret = meson_encoder_hdmi_init(priv);
 	if (ret)
-		goto exit_afbcd;
+		goto unbind_all;
 
 	ret = meson_plane_create(priv);
 	if (ret)
-		goto exit_afbcd;
+		goto unbind_all;
 
 	ret = meson_overlay_create(priv);
 	if (ret)
-		goto exit_afbcd;
+		goto unbind_all;
 
 	ret = meson_crtc_create(priv);
 	if (ret)
-		goto exit_afbcd;
+		goto unbind_all;
 
 	ret = request_irq(priv->vsync_irq, meson_irq, 0, drm->driver->name, drm);
 	if (ret)
-		goto exit_afbcd;
+		goto unbind_all;
 
 	drm_mode_config_reset(drm);
 
@@ -359,6 +359,9 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 
 uninstall_irq:
 	free_irq(priv->vsync_irq, drm);
+unbind_all:
+	if (has_components)
+		component_unbind_all(drm->dev, drm);
 exit_afbcd:
 	if (priv->afbcd.ops)
 		priv->afbcd.ops->exit(priv);
-- 
2.39.2