linux-kernel - [patch] drm: rockchip: signedness bug in dw_mipi_dsi_get_lane

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Message-ID: <20160120095352.GA19898@mwanda>
Date:	Wed, 20 Jan 2016 12:53:52 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Mark Yao <mark.yao@...k-chips.com>,
	Chris Zhong <zyw@...k-chips.com>
Cc:	David Airlie <airlied@...ux.ie>, Heiko Stuebner <heiko@...ech.de>,
	dri-devel@...ts.freedesktop.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] drm: rockchip: signedness bug in dw_mipi_dsi_get_lane_bps()

"bpp" needs to be signed for the error handling to work.

Fixes: 84e05408fcfe ('drm: rockchip: Support Synopsys DW MIPI DSI')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 7bfe243..c35e5af 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
@@ -461,7 +461,8 @@ 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;
+	int bpp;
+	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;