linux-kernel - Re: [PATCH V2 6/7] i2c: sprd: Increase the waiting time for I2C transmission to avoid system crash issues

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Date:   Mon, 23 Oct 2023 19:39:24 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Huangzheng Lai <Huangzheng.Lai@...soc.com>,
        Andi Shyti <andi.shyti@...nel.org>
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        huangzheng lai <laihuangzheng@...il.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: Re: [PATCH V2 6/7] i2c: sprd: Increase the waiting time for I2C
 transmission to avoid system crash issues



On 10/23/2023 4:11 PM, Huangzheng Lai wrote:
> Due to the relatively low priority of the isr_thread, when the CPU
> load is high, the execution of sprd_i2c_isr_thread will be delayed.
> After the waiting time is exceeded, the I2C driver will perform
> operations such as disabling the I2C controller. Later, when
> sprd_i2c_isr_thread is called by the CPU, there will be kernel panic
> caused by illegal access to the IIC register. After pressure testing,
> we found that increasing the IIC waiting time to 10 seconds can
> avoid this problem.
> 
> Fixes: 0b884fe71f9e ("i2c: sprd: use a specific timeout to avoid system hang up issue")
> Cc: <stable@...r.kernel.org> # v5.11+
> Signed-off-by: Huangzheng Lai <Huangzheng.Lai@...soc.com>

Looks reasonable to me.
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> ---
>   drivers/i2c/busses/i2c-sprd.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
> index b65729ba7d5a..dbdac89ad482 100644
> --- a/drivers/i2c/busses/i2c-sprd.c
> +++ b/drivers/i2c/busses/i2c-sprd.c
> @@ -74,7 +74,7 @@
>   /* timeout (ms) for pm runtime autosuspend */
>   #define SPRD_I2C_PM_TIMEOUT	1000
>   /* timeout (ms) for transfer message */
> -#define I2C_XFER_TIMEOUT	1000
> +#define I2C_XFER_TIMEOUT	10000
>   /* dynamic modify clk_freq flag  */
>   #define I2C_3M4_FLAG		0x0100
>   #define I2C_1M_FLAG		0x0080