linux-kernel - [PATCH V2 13/18] i2c: imx-lpi2c: fix type char overflow issue when calculating the clock cycle

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Date:   Tue,  6 Apr 2021 19:33:01 +0800
From:   Clark Wang <xiaoning.wang@....com>
To:     aisheng.dong@....com, robh+dt@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, festevam@...il.com
Cc:     kernel@...gutronix.de, linux-imx@....com,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 13/18] i2c: imx-lpi2c: fix type char overflow issue when calculating the clock cycle

Claim clkhi and clklo as integer type to avoid possible calculation
errors caused by data overflow.

Signed-off-by: Clark Wang <xiaoning.wang@....com>
Reviewed-by: Fugang Duan <fugang.duan@....com>
Reviewed-by: Dong Aisheng <aisheng.dong@....com>
---
V2 changes:
 - No change. Has been reviewed by Dong Aisheng <aisheng.dong@....com> in V1.
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index d124c4000823..c2f8e49660ea 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -213,8 +213,8 @@ static void lpi2c_imx_stop(struct lpi2c_imx_struct *lpi2c_imx)
    CLKHI = I2C_CLK_RATIO * clk_cycle */
 static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
 {
-	u8 prescale, filt, sethold, clkhi, clklo, datavd;
-	unsigned int clk_rate, clk_cycle;
+	u8 prescale, filt, sethold, datavd;
+	unsigned int clk_rate, clk_cycle, clkhi, clklo;
 	enum lpi2c_imx_pincfg pincfg;
 	unsigned int temp;
 
-- 
2.25.1