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From: trix@redhat.com
To: a.hajda@samsung.com, narmstrong@baylibre.com,
	Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se,
	jernej.skrabec@siol.net, airlied@linux.ie, daniel@ffwll.ch,
	architt@codeaurora.org
Cc: stable@vger.kernel.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org, Tom Rix <trix@redhat.com>
Subject: [PATCH] drm/bridge: sil_sii8620: initialize return of sii8620_readb
Date: Sun, 12 Jul 2020 08:24:53 -0700	[thread overview]
Message-ID: <20200712152453.27510-1-trix@redhat.com> (raw)

From: Tom Rix <trix@redhat.com>

clang static analysis flags this error

sil-sii8620.c:184:2: warning: Undefined or garbage value
  returned to caller [core.uninitialized.UndefReturn]
        return ret;
        ^~~~~~~~~~

sii8620_readb calls sii8620_read_buf.
sii8620_read_buf can return without setting its output
pararmeter 'ret'.

So initialize ret.

Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")

Signed-off-by: Tom Rix <trix@redhat.com>
---
 drivers/gpu/drm/bridge/sil-sii8620.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index 3540e4931383..da933d477e5f 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
 
 static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
 {
-	u8 ret;
+	u8 ret = 0;
 
 	sii8620_read_buf(ctx, addr, &ret, 1);
 	return ret;
-- 
2.18.1

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WARNING: multiple messages have this Message-ID (diff)
From: trix@redhat.com
To: a.hajda@samsung.com, narmstrong@baylibre.com,
	Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se,
	jernej.skrabec@siol.net, airlied@linux.ie, daniel@ffwll.ch,
	architt@codeaurora.org
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org, Tom Rix <trix@redhat.com>
Subject: [PATCH] drm/bridge: sil_sii8620: initialize return of sii8620_readb
Date: Sun, 12 Jul 2020 08:24:53 -0700	[thread overview]
Message-ID: <20200712152453.27510-1-trix@redhat.com> (raw)

From: Tom Rix <trix@redhat.com>

clang static analysis flags this error

sil-sii8620.c:184:2: warning: Undefined or garbage value
  returned to caller [core.uninitialized.UndefReturn]
        return ret;
        ^~~~~~~~~~

sii8620_readb calls sii8620_read_buf.
sii8620_read_buf can return without setting its output
pararmeter 'ret'.

So initialize ret.

Fixes: ce6e153f414a ("drm/bridge: add Silicon Image SiI8620 driver")

Signed-off-by: Tom Rix <trix@redhat.com>
---
 drivers/gpu/drm/bridge/sil-sii8620.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/sil-sii8620.c b/drivers/gpu/drm/bridge/sil-sii8620.c
index 3540e4931383..da933d477e5f 100644
--- a/drivers/gpu/drm/bridge/sil-sii8620.c
+++ b/drivers/gpu/drm/bridge/sil-sii8620.c
@@ -178,7 +178,7 @@ static void sii8620_read_buf(struct sii8620 *ctx, u16 addr, u8 *buf, int len)
 
 static u8 sii8620_readb(struct sii8620 *ctx, u16 addr)
 {
-	u8 ret;
+	u8 ret = 0;
 
 	sii8620_read_buf(ctx, addr, &ret, 1);
 	return ret;
-- 
2.18.1


             reply	other threads:[~2020-07-12 15:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200712152516eucas1p2cd883f7ccfcbfa78d452ba7a5641c363@eucas1p2.samsung.com>
2020-07-12 15:24 ` trix [this message]
2020-07-12 15:24   ` [PATCH] drm/bridge: sil_sii8620: initialize return of sii8620_readb trix
2020-07-12 15:34   ` Laurent Pinchart
2020-07-12 15:34     ` Laurent Pinchart
2020-07-13 15:29   ` Andrzej Hajda
2020-07-13 15:29     ` Andrzej Hajda
2020-07-13 16:00   ` Sam Ravnborg
2020-07-13 16:00     ` Sam Ravnborg

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