linux-kernel - RE: [PATCH 10/11] i2c: imx-lpi2c: fix type char overflow issue when calculating the clock cycle

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Date:   Fri, 19 Mar 2021 05:16:18 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Clark Wang <xiaoning.wang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 10/11] i2c: imx-lpi2c: fix type char overflow issue when
 calculating the clock cycle

> From: Clark Wang <xiaoning.wang@....com>
> Sent: Wednesday, March 17, 2021 2:54 PM
> 
> Claim clkhi and clklo as integer type to avoid possible calculation errors caused
> by data overflow.
> 
> Reviewed-by: Fugang Duan <fugang.duan@....com>
> Signed-off-by: Clark Wang <xiaoning.wang@....com>

Reviewed-by: Dong Aisheng <aisheng.dong@....com>

Regards
Aisheng

> ---
>  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 5dbe85126f24..1e26672d47bf 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