linux-kernel - [PATCH v2] drm/omap: dsi: fix unreachable code in dsi_vc_send

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Date:   Tue, 26 Jan 2021 17:51:17 -0800
From:   menglong8.dong@...il.com
To:     tomba@...nel.org, sebastian.reichel@...labora.com
Cc:     airlied@...ux.ie, daniel@...ll.ch,
        laurent.pinchart@...asonboard.com, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Menglong Dong <dong.menglong@....com.cn>
Subject: [PATCH v2] drm/omap: dsi: fix unreachable code in dsi_vc_send_short()

From: Menglong Dong <dong.menglong@....com.cn>

The 'r' in dsi_vc_send_short() is of type 'unsigned int', so the
'r < 0' can't be true.

Fix this by introducing a 'err' of type 'int' insteaded.

Fixes: 1ed6253856cb ("drm/omap: dsi: switch dsi_vc_send_long/short to mipi_dsi_msg")

Signed-off-by: Menglong Dong <dong.menglong@....com.cn>
Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
---
v2:
- remove word wrap in 'Fixes' tag
---
 drivers/gpu/drm/omapdrm/dss/dsi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 8e11612f5fe1..febcc87ddfe1 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -2149,11 +2149,12 @@ static int dsi_vc_send_short(struct dsi_data *dsi, int vc,
 			     const struct mipi_dsi_msg *msg)
 {
 	struct mipi_dsi_packet pkt;
+	int err;
 	u32 r;
 
-	r = mipi_dsi_create_packet(&pkt, msg);
-	if (r < 0)
-		return r;
+	err = mipi_dsi_create_packet(&pkt, msg);
+	if (err)
+		return err;
 
 	WARN_ON(!dsi_bus_is_locked(dsi));
 
-- 
2.25.1