From: Andrzej Hajda <a.hajda@samsung.com>
Date: Thu, 14 Jan 2016 08:59:02 +0000 (+0100)
Subject: UPSTREAM: drm/rockchip/dsi: fix handling mipi_dsi_pixel_format_to_bpp result
X-Git-Tag: firefly_0821_release~3142
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b498b62d7644f0e0795c5c63ec2b6fbddbb76d14;p=firefly-linux-kernel-4.4.55.git

UPSTREAM: drm/rockchip/dsi: fix handling mipi_dsi_pixel_format_to_bpp result

The function can return negative value so it should be assigned to signed
variable.

The problem has been detected using patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci.

Change-Id: Ide4daa64ce996d125b2f698e6f2d4899591e8065
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Chris Zhong <zyw@rock-chips.com>
(cherry picked from commit 484bb6c969523aa547d854bb57104339ee4aa800)
---

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 7bfe243c6173..f8f8f29fb7c3 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -461,10 +461,11 @@ static int dw_mipi_dsi_phy_init(struct dw_mipi_dsi *dsi)
 
 static int dw_mipi_dsi_get_lane_bps(struct dw_mipi_dsi *dsi)
 {
-	unsigned int bpp, i, pre;
+	unsigned int i, pre;
 	unsigned long mpclk, pllref, tmp;
 	unsigned int m = 1, n = 1, target_mbps = 1000;
 	unsigned int max_mbps = dptdin_map[ARRAY_SIZE(dptdin_map) - 1].max_mbps;
+	int bpp;
 
 	bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);
 	if (bpp < 0) {