linux-kernel - [PATCH 01/11] drm/bridge: tc358768: Fix use of uninitialized variable

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Message-Id: <20230804-tc358768-v1-1-1afd44b7826b@ideasonboard.com>
Date:   Fri, 04 Aug 2023 13:44:06 +0300
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>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Péter Ujfalusi <peter.ujfalusi@...il.com>,
        Francesco Dolcini <francesco@...cini.it>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Aradhya Bhatia <a-bhatia1@...com>,
        Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH 01/11] drm/bridge: tc358768: Fix use of uninitialized
 variable

smatch reports:

drivers/gpu/drm/bridge/tc358768.c:223 tc358768_update_bits() error: uninitialized symbol 'orig'.

Fix this by bailing out from tc358768_update_bits() if the
tc358768_read() produces an error.

Fixes: ff1ca6397b1d ("drm/bridge: Add tc358768 driver")
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/gpu/drm/bridge/tc358768.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/bridge/tc358768.c b/drivers/gpu/drm/bridge/tc358768.c
index 819a4b6ec2a0..bc97a837955b 100644
--- a/drivers/gpu/drm/bridge/tc358768.c
+++ b/drivers/gpu/drm/bridge/tc358768.c
@@ -216,6 +216,10 @@ static void tc358768_update_bits(struct tc358768_priv *priv, u32 reg, u32 mask,
 	u32 tmp, orig;
 
 	tc358768_read(priv, reg, &orig);
+
+	if (priv->error)
+		return;
+
 	tmp = orig & ~mask;
 	tmp |= val & mask;
 	if (tmp != orig)

-- 
2.34.1