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[85.29.92.32]) by smtp.gmail.com with ESMTPSA id 5-20020ac24825000000b004fe0c3d8bb4sm783212lft.84.2023.08.11.09.17.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Aug 2023 09:17:47 -0700 (PDT) Message-ID: <09c63a63-4967-4289-9538-e144842de8c3@gmail.com> Date: Fri, 11 Aug 2023 19:19:49 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/11] drm/bridge: tc358768: Fix use of uninitialized variable Content-Language: en-US To: Tomi Valkeinen , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Francesco Dolcini References: <20230804-tc358768-v1-0-1afd44b7826b@ideasonboard.com> <20230804-tc358768-v1-1-1afd44b7826b@ideasonboard.com> From: =?UTF-8?Q?P=C3=A9ter_Ujfalusi?= In-Reply-To: <20230804-tc358768-v1-1-1afd44b7826b@ideasonboard.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Aradhya Bhatia Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 04/08/2023 13:44, Tomi Valkeinen wrote: > 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 > --- > 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); > + no need for blank line > + if (priv->error) > + return; > + > tmp = orig & ~mask; > tmp |= val & mask; > if (tmp != orig) > -- Péter