linux-kernel - Re: [PATCH] i2c: nvidia-gpu: Handle timeout correctly in gpu_i2c_check

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Message-Id: <9771BC92-1785-4E9A-81C7-E72C2C65CE22@canonical.com>
Date:   Tue, 24 Mar 2020 19:12:13 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Wolfram Sang <wsa@...-dreams.de>
Cc:     ajayg@...dia.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "open list:I2C CONTROLLER DRIVER FOR NVIDIA GPU" 
        <linux-i2c@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: nvidia-gpu: Handle timeout correctly in
 gpu_i2c_check_status()

Hi Wolfram,

> On Mar 24, 2020, at 19:09, Wolfram Sang <wsa@...-dreams.de> wrote:
> 
> 
>> 	} while (time_is_after_jiffies(target));
>> 
>> -	if (time_is_before_jiffies(target)) {
>> +	if (time_is_before_eq_jiffies(target)) {
> 
> While unlikely, there is a tiny race between the time_is_* calls,
> jiffies could update inbetween them.
> 
> So, for the sake of good programming practice, I'd recommend to set a
> flag in the do_while-loop and the have the logic above solely based on
> the flag.
> 

Ok, I'll send a v2 based on your suggestion.

Kai-Heng