linux-kernel - [PATCH 2/2] drm/bridge: sii902x: Fix audio codec unregistration

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Date: Wed, 03 Jan 2024 15:31:08 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>, 
 Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>, 
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Boris Brezillon <bbrezillon@...nel.org>, Peter Rosin <peda@...ntia.se>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Fabrizio Castro <fabrizio.castro@...renesas.com>, 
 Jyri Sarha <jsarha@...com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Nishanth Menon <nm@...com>, Aradhya Bhatia <a-bhatia1@...com>, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH 2/2] drm/bridge: sii902x: Fix audio codec unregistration

The driver never unregisters the audio codec platform device, which can
lead to a crash on module reloading, nor does it handle the return value
from sii902x_audio_codec_init().

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Fixes: ff5781634c41 ("drm/bridge: sii902x: Implement HDMI audio support")
Cc: Jyri Sarha <jsarha@...com>
---
 drivers/gpu/drm/bridge/sii902x.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 69da73e414a9..4560ae9cbce1 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -1080,7 +1080,9 @@ static int sii902x_init(struct sii902x *sii902x)
 			return ret;
 	}
 
-	sii902x_audio_codec_init(sii902x, dev);
+	ret = sii902x_audio_codec_init(sii902x, dev);
+	if (ret)
+		return ret;
 
 	i2c_set_clientdata(sii902x->i2c, sii902x);
 
@@ -1088,13 +1090,15 @@ static int sii902x_init(struct sii902x *sii902x)
 					1, 0, I2C_MUX_GATE,
 					sii902x_i2c_bypass_select,
 					sii902x_i2c_bypass_deselect);
-	if (!sii902x->i2cmux)
-		return -ENOMEM;
+	if (!sii902x->i2cmux) {
+		ret = -ENOMEM;
+		goto err_unreg_audio;
+	}
 
 	sii902x->i2cmux->priv = sii902x;
 	ret = i2c_mux_add_adapter(sii902x->i2cmux, 0, 0, 0);
 	if (ret)
-		return ret;
+		goto err_unreg_audio;
 
 	sii902x->bridge.funcs = &sii902x_bridge_funcs;
 	sii902x->bridge.of_node = dev->of_node;
@@ -1107,6 +1111,12 @@ static int sii902x_init(struct sii902x *sii902x)
 	drm_bridge_add(&sii902x->bridge);
 
 	return 0;
+
+err_unreg_audio:
+	if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
+		platform_device_unregister(sii902x->audio.pdev);
+
+	return ret;
 }
 
 static int sii902x_probe(struct i2c_client *client)
@@ -1179,6 +1189,9 @@ static void sii902x_remove(struct i2c_client *client)
 
 	drm_bridge_remove(&sii902x->bridge);
 	i2c_mux_del_adapters(sii902x->i2cmux);
+
+	if (!PTR_ERR_OR_ZERO(sii902x->audio.pdev))
+		platform_device_unregister(sii902x->audio.pdev);
 }
 
 static const struct of_device_id sii902x_dt_ids[] = {

-- 
2.34.1